Geissmann, T., 1983: Female capped gibbon (Hylobates pileatus Gray 1891) sings male song. Journal of Human Evolution 12: 667-671.
Geissmann, T., 1984: Duet splitting and the evolution of gibbon (Hylobates spp.) song. Antropologia Contemporanea 7: 15 (Abstract only).
Geissmann, T., 1984: Inheritance of song parameters in the gibbon song, analysed in 2 hybrid gibbons (Hylobates pileatus x H. lar). Folia Primatologica 42: 216-235.
Geissmann, T., 1984: Pair-bonding function of siamang (Hylobates syndactylus) duet song. International Journal of Primatology 5: 341 (Abstract only).
Geissmann, T., 1986: Estimation of australopithecine stature from long bones: A.L.288-1 as a test case. Folia Primatologica 47: 119-127.
Geissmann, T., 1986: Length estimate for KNM-ER 736, a hominid femur from the Lower Pleistocene of East Africa. Human Evolution 1: 481-493.
Geissmann, T., 1986: Mate change enhances duetting activity in the siamang gibbon (Hylobates syndactylus). Behaviour 96: 17-27.
Geissmann, T., 1986: Sternal gland in the siamang, Hylobates syndactylus. Primate Report 14: 22-23 (Abstract only).
Geissmann, T., 1986: Twinning frequency in catarrhine primates. Primate Report 14: 100-101 (Abstract only).
Geissmann, T., 1987: A sternal gland in the siamang gibbon (Hylobates syndactylus). International Journal of Primatology 8: 1-15.
Geissmann, T., 1987: Age of sexual maturity in gibbons (Hylobates spp). International Journal of Primatology 8: 497 (Abstract only).
Geissmann, T., 1987: Evolution of facial markings in gibbons (Hylobates spp.). International Journal of Primatology 8: 540 (Abstract only).
Geissmann, T., 1987: Occurrence of sternal and axillary glands in hominoids. Chemical Senses 12: 177-178 (Abstract only).
Geissmann, T., 1987: Songs of hybrid gibbons (Hylobates lar x H. lar). International Journal of Primatology 8: 540 (Abstract only).
Geissmann, T., 1989: A female black gibbon, Hylobates concolor subspecies, from northeastern Vietnam. International Journal of Primatology 10: 455-476.
Geissmann, T., 1989: Multiple Births in Catarrhine Monkeys and Apes - A Review. Il Sedicesimo, Firenze. 78 pp. ISBN 88-85342-02-7.
Geissmann, T., 1990: Familial incidence of multiple births in a colony of chimpanzees (Pan troglodytes). Journal of Medical Primatology 19: 467-478.
Geissmann, T., 1990: Songs of different types of hybrid gibbons follow a common principle. 13th Congress of IPS Abstracts, p. 186. Nagoya.
Geissmann, T., 1990: Systematics of crested gibbons (Hylobates concolor group). Abstracts, International Symposium on Primate Conservation in China, pp. 82-83, Kunming Institute of Zoology, Kunming.
Geissmann, T., 1990: Twinning frequency in catarrhine primates. Human Evolution 5: 387-396.
Geissmann, T., 1991: A reassessment of age of sexual maturity in gibbons (Hylobates spp.). American Journal of Primatology 23: 11-22.
Geissmann, T., 1991: Sympatry between white-handed gibbons (Hylobates lar) and pileated gibbons (H. pileatus) in southeastern Thailand. Primates 32: 357-363.
Geissmann, T., 1991: The Spaeth gibbon collection. Natural History Bulletin of the Siam Society 39: 53-70.
Geissmann, T., 1993: Hypertrichosis in a gibbon (Hylobates muelleri). Journal of Medical Primatology 22: 317-319.
Geissmann, T., 1994: Systematik der Gibbons. Zeitschrift des Kölner Zoo 37: 65-77.
Geissmann, T., 1995: Captive management and conservation of gibbons in China and Vietnam, with special reference to crested gibbons (Hylobates concolor group). Primate Report 42: 29-41.
Geissmann, T., 1995: Gibbon systematics and species identification. International Zoo News 42: 467-501.
Geissmann, T., 1995: The yellow-cheeked gibbons (Hylobates gabriellae) in Nam Bai Cat Tien (southern Vietnam) revisited. Primates 36: 447-455.
Geissmann, T., 1996: Einsichten in der Affensystematik. UniZürich (Magazin der Universität Zürich) 1996 (2): 71 (German text).
Geissmann, T., 1996: New sounds from the crested gibbons (Hylobates concolor group): First results of a systematic revision. In: Abstracts, XVIth Congress of the International Primatological Society, Madison, Wisconsin, U.S.A., August 11-16, 1996, abstract no. 480, Wisconsin Regional Primate Research Center, Madison.
Geissmann, T., 1997: New sounds from the crested gibbons (Hylobates concolor group): First results of a systematic revision. Verhandlungen der Deutschen Zoologischen Gesellschaft: Kurzpublikationen - Short Communications, 90. Jahresversammlung 1997 in Mainz, p. 170. Gustav Fischer, Stuttgart.
Geissmann, T., 1998: Body weight in wild gibbons (Hylobatidae). In: Abstracts, XVIIth Congress of the International Primatological Society, August 10-14, 1998, abstract no. 282, University of Antananarivo, Madagascar.
Geissmann, T., 1999: Duet songs of the siamang, Hylobates syndactylus: II. Testing the pair-bonding hypothesis during a partner exchange. Behaviour 136: 1005-1039.
Geissmann, T., 1999: Taxonomy and evolution of gibbons. In: Primatology and Anthropology into the Third Millennium. Centenary Congress of the Anthropological Institute in Zürich: 1899-1999, Programme and Abstracts, p. 20, Anthropological Institute, Zürich (Abstract only).
Geissmann, T., 2000: A reassessment of the evolution and adaptive radiation of gibbons. In: The apes: Challenges for the 21st century. Brookfield Zoo, May 10-13, 2000, Programme and Abstracts, p. 37, Chicago Zoological Society, Brookfield, Illinois, U.S.A. (Abstract only).
Geissmann, T., 2000: Duet songs of the siamang, Hylobates syndactylus: I. Structure and organisation. Primate Report 56: 33-60.
Geissmann, T., 2000: Duet splitting in the evolution of gibbon songs - Duet Splitting in der Evolution von Gibbon-Gesängen. Folia Primatologica 71: 194 (Abstract only).
Geissmann, T., 2000: Gibbon songs and human music from an evolutionary perspective. In: Wallin, N.; Merker, B. & Brown, S. (eds.), The Origins of Music, pp. 103-123. MIT Press, Cambridge, Massachusetts.
Geissmann, T., 2001: A model of inheritance in gibbon songs. In: The XVIIIth congress of the International Primatological Society: Primates in the new millennium. Abstracts and programme, Adelaide, South Australia, p. 126.
Geissmann, T., 2001: A reassessment of the evolution and adaptive radiation of gibbons. In: The apes: Challenges for the 21st century, Brookfield Zoo, May 10-13, 2000, Conference Proceedings, p. 361, Chicago Zoological Society, Brookfield, Illinois, U.S.A. (Abstract only).
Geissmann, T., 2001: Neue Primatenart auf Madagaskar entdeckt. Tierärztliche Umschau 56(4): 216 (German text).
Geissmann, T., 2001: TiHo-Forscher warnt: Heimliches Aussterben der Kleinen Menschenaffen in Indochina. TiHo-Anzeiger (Tierärztliche Hochschule Hannover) 30 (6): 8 (German text).
Geissmann, T., 2002: Duet-splitting and the evolution of gibbon songs. Biological Reviews 77: 57-76.
Geissmann, T., 2002: Gibbon diversity and conservation. In: Caring for primates. Abstracts of the XIXth congress of the International Primatological Society, 4th-9th August, 2002, Beijing, China, pp. 112-113. Mammalogical Society of China, Beijing.
Geissmann, T., 2002: Gibbons: In the shadow of the great apes. In: Caring for primates. Abstracts of the XIXth congress of the International Primatological Society, 4th-9th August, 2002, Beijing, China, pp. 119-120. Mammalogical Society of China, Beijing.
Geissmann, T., 2002: Taxonomy and evolution of gibbons. In: Soligo, C.; Anzenberger, G. & Martin, R.D. (eds.) Anthropology and primatology into the third millennium: The Centenary Congress of the Zürich Anthropological Institute (Evolutionary Anthropology Vol. 11, Supplement 1), pp. 28-31. Wiley-Liss, New York.
Geissmann, T., 2002: Verhaltensbiologische Forschungsmethoden: Eine Einführung [Research Methods in Ethology: An Introduction]. Schüling Verlag, Münster. 60 pp. ISBN 3-634849-64-4.
Geissmann, T., 2003: Circumfacial markings in siamang and evolution of the face ring in the Hylobatidae. International Journal of Primatology 24: 143-158.
Geissmann, T., (compiler), 2003: Symposium on gibbon diversity and conservation: Concluding resolution. Asian Primates 8(3-4): 28-29.
Geissmann, T., 2003: Tape-recording primate vocalisations. In: Setchell, J.M. & Curtis, D.J. (eds.), Field and Laboratory Methods in Primatology: A Practical Guide, pp. 228-238. Cambridge University Press, Cambridge.
Geissmann, T., 2003: Vergleichende Primatologie [Comparative Primatology]. Springer Verlag, Berlin, Heidelberg & New York. XII + 357 pp. ISBN 3-540-43645-6.
Geissmann, T., in press: Inter-group conflict in captive siamangs. In: Galdikas, B.M.F.; Briggs, N.; Sheeran, L.K. & Shapiro, G.L. (eds.), Great and Small Apes of the World, Volume II: Orangutans and Gibbons. Kluwer, New York.
Geissmann, T. & Braendle, C., 1997: Helping behaviour in captive pileated gibbons (Hylobates pileatus). Folia Primatologica 68: 110-112.
Geissmann, T. & Chan, B., 2004: The Hainan black crested gibbon: Most critically endangered ape. Folia Primatologica 75, Supplement 1: 116 (Abstract only).
Geissmann, T. & Dallmann, R., 2002: Die Gesänge der Gibbons und die Evolution der Musik. Praxis der Naturwissenschaften 51 (1): 21-29 (German text).
Geissmann, T. & Hulftegger, A. M., 1994: Olfactory communication in gibbons? In: Roeder, J.J.; Thierry, B.; Anderson, J.R. & Herrenschmidt, N. (eds.), Current Primatology, vol. 2: Social Development, Learning and Behaviour, pp. 199-206. Université Louis Pasteur, Strasbourg.
Geissmann, T. & Lim, K.K.P., 1994: Extraction of bacula from tanned gibbon skins. Raffles Bulletin of Zoology 42: 775-780.
Geissmann, T. & Manella, B., in press: Steroid secretion in siamang (Symphalangus syndactylus) skin glands. In: Galdikas, B.M.F.; Briggs, N.; Sheeran, L.K. & Shapiro, G.L. (eds.), Great and Small Apes of the World, Volume II: Orangutans and Gibbons. Kluwer, New York.
Geissmann, T. & Nijman, V., 1999: Singing behavior of the silvery gibbon (Hylobates moloch) in Central Java, Indonesia. Primate Report 54: 18-19 (Abstract only).
Geissmann, T. & Nijman, V., 2000: Do male silvery gibbons have anything to say? Folia Primatologica 71: 225 (Abstract only).
Geissmann, T. & Nijman, V., 2001: Calling behaviour of wild Javan gibbons Hylobates moloch in Java, Indonesia. In: Nijman, V. (ed.), Forest (and) Primates: Conservation and Ecology of the Endemic Primates of Java and Borneo. Tropenbos-Kalimantan Series Vol. 5, pp. 43-59. Tropenbos International, Wageningen, The Netherlands.
Geissmann, T. & Orgeldinger, M., 1995: Neonatal weight in gibbons (Hylobates spp.). American Journal of Primatology 36: 179-189.
Geissmann, T. & Orgeldinger, M., 1997: Pair bond and duet songs in siamangs (Hylobates syndactylus). In: Advances in Ethology, Vol. 32: Contributions to the XXV International Ethological Conference, Vienna, Austria, 20-27 August, 1997 (Taborsky M. & Taborsky B., eds.), p. 123, Blackwell, Berlin & Vienna (Abstract only).
Geissmann, T. & Orgeldinger, M., 1998: Duet or divorce! Folia Primatologica 69: 283 (Abstract only).
Geissmann, T. & Orgeldinger, M., 2000: The relationship between duet songs and pair bonds in siamangs, Hylobates syndactylus. Animal Behaviour 60: 805-809.
Geissmann, T. & Vu Ngoc Thanh, 2001: Preliminary results of a primate survey in northeastern Vietnam, with special reference to gibbons. Asian Primates 7(3-4): 0-4.
Geissmann, T.; Bohlen-Eyring, S. & Heuck, A., 2004: The male song of the Javan silvery gibbon (Hylobates moloch). Folia Primatologica 75, Supplement 1: 266-267 (Abstract only).
Geissmann, T.; Bohlen-Eyring, S. & Heuck, A., in press: The male song of the Javan silvery gibbon (Hylobates moloch). Contributions to Zoology (in press).
Geissmann, T.; Dallmann, R. & Pastorini, J., 2002: The Javan silvery gibbon (Hylobates moloch): Are there several subspecies? In: Caring for primates. Abstracts of the XIXth congress of the International Primatological Society, 4th-9th August, 2002, Beijing, China, pp. 120-121. Mammalogical Society of China, Beijing.
Geissmann, T.; Groves, C.P. & Roos, C., 2004: The Tenasserim Lutung, Trachypithecus barbei (Blyth, 1847) (Primates: Cercopithecidae): Description of a live specimen, and a reassessment of phylogenetic affinities, taxonomic history, and distribution. Contributions to Zoology 73 (4): in press.
Geissmann, T.; Hulftegger, A.-M. & Geyer, H., 1992: Olfactory communication in gibbons? In: Abstracts, Fourteenth Congress of the International Primatological Society, Strasbourg, France, August 16-21, 1992, p. 129, Strasbourg.
Geissmann, T.; La Quang Trung; Trinh Dinh Hoang; Vu Dinh Thong; Dang Ngoc Can & Pham Duc Tien, 2003: Rarest ape species rediscovered in Vietnam. Asian Primates 8(3-4): 8-9.
Geissmann, T.; Manella, B. & Zachmann, M., 1992: Skin glands and steroid hormones in gibbons and the great apes. In: Abstracts, Tenth Congress of ECRO, Munich, Germany, August 23-28, 1992, p. 43, Munich.
Geissmann, T.; Nguyen Xuan Dang; Lormée, N. & Momberg, F., 2000: Vietnam Primate Conservation Status Review 2000, Part 1: Gibbons. Fauna & Flora International, Indochina Programme, Hanoi. 130 pp. Edition in English language. ISBN 1-903703-03-4.
Geissmann, T.; Nguyen Xuan Dang; Lormée, N. & Momberg, F., 2000: [Vietnam Primate Conservation Status Review 2000, Part 1: Gibbons.] Fauna & Flora International, Indochina Programme, Hanoi. 142 pp. Edition in Vietnamese language.
Geissmann, T.; Nguyen Xuan Dang; Lormée, N. & Momberg, F., 2001: Conservation status of gibbons in Vietnam. Folia Primatologica 72: 161 (Abstract only).
Geissmann, T.; Nguyen Xuan Dang; Lormée, N. & Momberg, F., 2003: Vietnam primate conservation status review 2000, Part 1: Gibbons (Summary). Asian Primates 8(3-4): 42.
Geissmann, T.; Nguyen Xuan Dang; Lormée, N. & Momberg, F., 2003: Status review of gibbons in Vietnam. Asian Primates 8(3-4): 10-12.
Baker, L.R.; Geissmann, T.; Nadler, T.; Long, B. & Walston, J., 2002: Cambodia: Primate Field Guide. Fauna & Flora International Cambodia, Phnom Penh. 8 pp. (English and Khmer text).
Baker, L.R.; Nadler, T. & Geissmann, T., 2000: Viet Nam: Primate Field Guide. Fauna & Flora International, Indochina Programme, Hanoi. 8 pp. (English and Vietnamese text).
Braendle, C. & Geissmann, T., 1997: Behavioural development of a pileated gibbon (Hylobates pileatus). International Zoo News 44: 4-16.
Brandon-Jones, D.; Eudey, A. A.; Geissmann, T.; Groves, C. P.; Melnick, D. J.; Morales, J. C.; Shekelle, M. & Stewart, C.-B., 2004: Asian Primate Classification. International Journal of Primatology 25: 97-164.
Chen, H.-C.; Geissmann, T. & Chen, P.-C., 2004: A survey of the taxonomic status of captive gibbons in Taiwan. The Raffles Bulletin of Zoology 52: 265-269.
Christen, A. & Geissmann, T., 1994: Primate survey in northern Bolivia with special reference to Goeldi's monkey, Callimico goeldii. International Journal of Primatology 15: 239-274.
Dal Pra, G. & Geissmann, T., 1994: Behavioural development of twin siamangs (Hylobates syndactylus). Primates 35: 325-342.
Dallmann, R. & Geissmann T., 2001: Different levels of variability in the female song of wild silvery gibbons (Hylobates moloch). Behaviour 138: 629-648.
Dallmann, R. & Geissmann T., 2001: Individuality in the female songs of wild silvery gibbons (Hylobates moloch) on Java, Indonesia. Contributions to Zoology 70: 41-50.
Dallmann, R. & Geissmann, T., 2000: Individuality in the songs of wild silvery gibbons of Java. Folia Primatologica 71: 220 (Abstract only).
Dallmann, R. & Geissmann, T., 2001: Different levels of variability in the female song of wild silvery gibbons Hylobates moloch. In: The XVIIIth congress of the International Primatological Society: Primates in the new millennium. Abstracts and programme, Adelaide, South Australia, p. 127.
Davila Ross, M. & Geissmann, T., 2004: Biphonation in orangutan long calls. Folia Primatologica 75, Supplement 1: 368-369 (Abstract only).
Dielentheis, T.F.; Zaiss, E. & Geissmann, T., 1991: Infant care in a family of siamangs (Hylobates syndactylus) with twin offspring at Berlin Zoo. Zoo Biology 10: 309-317.
Dielentheis, T.F.; Zaiss, E.; Schulz, C. & Geissmann, T., 1991: Zum Helfer- und Eltern-Kind-Verhalten bei Siamangs (Hylobates syndactylus) mit Zwillingsnachwuchs im Berliner Zoo - A siamang family with twin offspring. Zeitschrift für Säugetierkunde, Sonderheft zu Band 56: 9-10 (Abstract only).
Fischer, J. & Geissmann T., 1989: Group harmony in gibbons: Comparison between white-handed gibbon (Hylobates lar) and siamang (Hylobates syndactylus). Primate Report 25: 11-12 (Abstract only).
Fischer, J.O. & Geissmann, T., 1990: Group harmony in gibbons: Comparison between white-handed gibbon (Hylobates lar) and siamang (Hylobates syndactylus). Primates 31 (4): 481-494.
Heine, A. & Geissmann, T., 2000: Gibbon ethograms: What makes the difference? Folia Primatologica 71: 228 (Abstract only).
Hellekant, G.; DuBois, G.; Geissmann, T.; Glaser, D. & Van der Wel, H., 1990: Taste responses of chorda tympani proper nerve in the white-handed gibbon (Hylobates lar). In: Døving, K.B. (ed.), ISOT X. Proceedings of the Tenth International Symposium on Olfaction and Taste, Oslo, Norway, July 16 - 20, 1989, pp. 115-131. GCS (Graphic Communication System), Oslo.
Hellekant, G.; Geissmann, T.; Glaser, D. & Hard av Segerstad, C., 1990: Taste responses of chorda tympani proper nerve in the white-handed gibbon (Hylobates lar). In: Døving, K.B. (ed.), ISOT X. Proceedings of the Tenth International Symposium on Olfaction and Taste, Oslo, Norway, July 16 - 20, 1989, p. 300. GCS (Graphic Communication System), Oslo (Abstract only).
Konrad, R. & Geissmann, T., 2004: Vocal diversity and taxonomy of crested gibbons (Nomascus spp.) in Cambodia. Folia Primatologica 75, Supplement 1: 288-289 (Abstract only).
La Quang Trung; Trinh Dinh Hoang; Long, B. & Geissmann, T., 2002: Status review of black crested gibbons (Nomascus concolor and Nomascus sp. cf. nasutus) in Vietnam. In: Caring for primates. Abstracts of the XIXth congress of the International Primatological Society, 4th-9th August, 2002, Beijing, China, pp. 131-132. Mammalogical Society of China, Beijing.
Nijman, V. & Geissmann, T., 2001: Calling behaviour of male silvery gibbons on Java, Indonesia. In: The XVIIIth congress of the International Primatological Society: Primates in the new millennium. Abstracts and programme, Adelaide, South Australia, p. 128.
Roos, C. & Geissmann, T., 2001: Molecular phylogeny of the major hylobatid divisions. Molecular Phylogenetics and Evolution 19: 486-494.
Takacs, Z.; Morales, J. C.; Geissmann, T. & Melnick, D., 2001: Molecular phylogeny of Hylobatidae. In: The XVIIIth congress of the International Primatological Society: Primates in the new millennium. Abstracts and programme, Adelaide, South Australia, p. 393.
Thalmann, U. & Geissmann, T., 2000: Distribution and geographic variation in the western woolly lemur (Avahi occidentalis) with description of a new species. International Journal of Primatology 21: 915-941.
Thalmann, U.; Geissmann, T.; Mutschler, T. & Rakotoarison, N., 1992: Field observations on a recently discovered population of Avahi in western Madagascar. In: Abstracts, Fourteenth Congress of the International Primatological Society, Strasbourg, France, August 16-21, 1992, p. 240, Strasbourg.
Thalmann, U.; Geissmann, T.; Simona, A. & Mutschler, T., 1993: The indris of Anjanaharibe-Sud, northeastern Madagascar. International Journal of Primatology 14: 357-381.
Ujhelyi, M.; Merker, B.; Buk, P. & Geissmann, T., 2000: Observations on the behavior of gibbons (Hylobates leucogenys, H. gabriellae, and Hylobates lar) in the presence of mirrors. Journal of Comparative Psychology 114: 253-262.
Ziggiotti, E. & Geissmann, T., 1985: The genetical influence of the Matterhorn (Monte Cervino). Antropologia Contemopranea 8: 245-250.
Ziggiotti, E. & Geissmann, T., 1987: Genetic polymorphisms in three Alpine populations (Visp valleys, Switzerland). International Journal of Anthropology 2: 1-20.
