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Klingel H,. (1974). Soziale Organisation und Verhalten des Grevyzebras (Equus grevyi). Z. Tierpsychol., 36, 37–70.
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Klingel H,. (1977). Observations on Social Organization and Behaviour of African and Asiatic Wild Asses (Equus africanus and E. hemionus). Z. Tierpsychol., 44, 323–331.
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