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Klingel H,. (1968). Zebrafamilien dauern bis zum Tode. Das Tier 7, , 10–13.
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Klingel H,. (1968). Die Immobilisation von Steppenzebras. Zoolog Garten, 35, 54–66.
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Klingel H Klingel U,. (1968). Equus quagga: Begrüßung.
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Klingel H Klingel U,. (1968). Equus quagga: Kampfverhalten.
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Klingel H,. (1968). Das Sozialleben der Steppenzebras. Naturwissensch Medizin, 5, 10–21.
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Orlov Vn,. (1968). Equus Hemionus Pall. Geograficeskaja Sbornik trudov zool MGU, 10, 37–52.
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Rossdale Pd,. (1968). Abnormal perinatal behaviour in the thoroughbred horse. Brit Vet J., 124, 540–553.
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Rossdale Pd,. (1968). Perinatal behaviour int the thoroughbred horse. (Vol. Chapt. 15).
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Tembrock G,. (1968). Land mammals. (pp. 338–404).
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Urban Ek, B. L. (1968). Wildlife in an ethiopian valley. Oryx, 9, 342–353.
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