1. The role of risks in mammalian combat: zebra and onager fights;Berger;Z. Tierpsychol.,1981
2. Ecological and demographic influences on social behavior, harem stability, and male reproductive success in feral horses (Equus caballus);Franke Stevens,1987
3. The role of asymmetries in animal contests;Hammerstein;Anim. Behav.,1981
4. The development of social behaviour in immature males of a feral horse population (Equus caballus);Hoffman,1983
5. A comparison of the social behaviour of the Equidae;Klingel,1974