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Phillips, L. G. (1981). Palpebral coloboma in three snow leopards.
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Clevenger, S. A. (1980). Snow leopards born... and born... and born at OKC Zoo.
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von Dungern, D. F. (1910). Lulu, my snowleopard.
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Jones, M. L. (1977). The snow leopard in captivity (R. L. Eaton, Ed.) (Vol. III).
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Chubykina, H. L., Shilo, R.A. (1981). A study of diurnal activity rhythms in snow leopards and lynx (Panthera uncia and Felix lynx) at Novosibirsk Zoo. International Zoo Yearbook, 21, 193–196.
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