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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. |
Aspinall, J. (1979). New enclosures at Howletts and Port Lympne (Vol. 2). |
Aspinall, J. (1978). Some aspects of breeding tigers and other big cats. Friends of Howletts and Port Lympne, 1(Spring), 26–32. |
Asai, K. (1976). Animals waiting for salvation. |