Book Chapter
Hohmann, G.; Fowler, A.; Sommer, V.; Ortmann, S.: Frugivory and gregariousness of Salonga bonobos and Gashaka chimpanzees: The influence of abundance and nutritional quality of fruit. In: Feeding ecology in Apes and other Primates, pp. 123 - 159 (Eds. Hohmann, G.; Robbins, M. M.; Boesch, C.). Cambridge University Pr., Cambridge [u.a.] (2006)