1. Observational study of behaviour: sampling methods;Altmann;Behaviour,1974
2. Primate males go where the females are;Altmann;Anim Behav,1990
3. Preliminary survey on the population densities of Cacajao calvus ucayalii;Aquino;Primate Conserv,1988
4. Some observations on the ecology of Cacajao calvus ucayalii in the Peruvian Amazon;Aquino;Primate Conserv,1998
5. Fission-fusion dynamics: new research frameworks;Aureli;Curr Anthropol,2008