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Citation: R. Dallmann et T. Geissmann, Different levels of variability in the female song of wild silvery gibbons(Hylobates moloch), BEHAVIOUR, 138, 2001, pp. 629-648
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Citation: U. Thalmann et T. Geissmann, Distribution and geographic variation in the western woolly lemur (Avahi occidentalis) with description of a new species (A. unicolor), INT J PRIM, 21(6), 2000, pp. 915-941
Citation: T. Geissmann et M. Orgeldinger, The relationship between duet songs and pair bonds in siamangs, Hylobates syndactylus, ANIM BEHAV, 60, 2000, pp. 805-809
Citation: T. Geissmann, Duet songs of the siamang, Hylobates syndactylus: II. Testing the pair-bonding hypothesis during a partner exchange, BEHAVIOUR, 136, 1999, pp. 1005-1039