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Rieger, I. (1978). Scent marking behaviour of ounces, Uncia uncia. In L. Blomqvist (Ed.), International Pedigree Book of Snow Leopards, Vol. 1 (Vol. 1, pp. 78–103). Helsinki: Helsinki Zoo.
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Rieger, I. (1980). Some difficulty breeding ounces, (Uncia uncia) at zoological gardens. Int.Ped Book of Snow Leopards, 2, 76–95.
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Rieger, I. (1980). Some aspects of the history of ounce knowledge. In L. Blomqvist (Ed.), International Pedigree Book of Snow Leopards, Vol. 2 (Vol. 2, pp. 1–36). Helsinki: Helsinki Zoo.
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Rieger, I., & Peters, G. (1981). Observations on the mating and vocal behavior of snow leopards (Uncia-uncia) in zoological garden. Zeitschrift Fur Saugetierkunde International Journal of Mamamalian Biology, 46(1), 35–48.
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Rieger, I. (1982). Breeding ounces, Uncia uncia (Schreber, 1775) in zoological gardens. In L. Blomqvist (Ed.), International Pedigree Book of Snow Leopards, Vol. 3 (Vol. 3, pp. 49–50). Helsinki: Helsinki Zoo.
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Riordan, P. (1998). Unsupervised recognition of individual tigers and snow leopards from their footprints (Vol. 1).
Abstract: This study presents the testing of two unsupervised classification methods for their ability to accurately identify unknown individual tigers, Panthera tigris, and snow leopards, Panthera uncia, from their footprints. A neural-network based method, the Kohonen self-organizing map (SOM), and a Bayesian method, AutoClass, were assessed using hind footprints taken from captive animals under standardized conditions. AutoClass successfully discriminated individuals of both species from their footprints. Classification accuracy was greatest for tigers, with more misclassification of individuals occurring for snow leopards. Examination of variable influence on class formations failed to identify consistently influential measurements for either species. The self-organizing map did not provide accurate classification of individuals for either species. Results were not substantially improved by altering map dimensions nor by using principal components derived from the original data. The interpretation of resulting classifications and the importance of using such techniques in the study of wild animal populations are discussed. The need for further testing in the field is highlighted.
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Rishi, V. (1989). Snow leopards breed at Darjeeling Zoo. Zoo's Print, , 1–4.
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Roberts, T. J. (1977). The Mammals of Pakistan. London and Tonbridge: Ernest Benn.
Abstract: Brief description of physical characteristics, ecology,status, and distribution of snow leopard in Pakistan
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Rodenburg, W. F. (1977). The Trade in Wild Animal Furs in Afghanistan.
Abstract: Estimated that 70-80 snow leopard pelts were traded annually at the Kabul bazaar.
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Rosenthal, M., & Ott, J. L. (1988). Snow Leopard Captive Mangement Survey. Chicago: Lincon Park Zoological Gardens.
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