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2. Priorities for captive breeding - which animals should board the ark;Balmford,2000
3. Organizational systems and dominance in feral horses in the Grand Canyon;Berger;Behavioural Ecology and Sociobiology,1977
4. Wild horses of the Great Basin: social competition and population size;Berger,1986
5. The reintroduction of Przewalski horses in the Hustain Nuruu Mountain Forest Steppe Reserve in Mongolia;Bouman,1998