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Koivisto, I., Wahlberg, C., & Muuronnen, P. (1977). Breeding the snow leopard (Panthera Uncia) at the Helsinki Zoo 1967-1976. Int.Zoo Yearbook, 17, 39–44.
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Koivisto, I. (1978). Preface. In L. Blomqvist (Ed.), International Pedigree Book of Snow Leopards, Vol. 3 (Vol. 1, pp. 1–2). Helsinki: Helsinki Zoo.
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