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Volf J,. (1970). Pedigree book of the Przewalski – Horse.
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Volf J,. (1967). New sighting of Przewalski – horses? Z Säugetierk, 32, 245–246.
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Volf J,. (1958). Pour le sauvetage des chevaux de Przewalski. Mammalia, 22, 598–600.
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