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Lutz, H., Hofmann-Lehmann, R., Fehr, D., Leutenegger, C., Hartmann, M., Ossent, P., et al. (1996). Liberation of the wilderness of wild felids bred under human custody: Danger of release of viral infections. Schweizer Archiv fuer Tierheilkunde, 138(12), 579–585.
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Lutz, H., Isenbugel, E., & Lehmann, R. (1994). Retrovirus serology in snow leopards and other wild felids in European zoos. In J.L.Fox, & D.Jizeng (Eds.), (pp. 203–208). Usa: Islt.
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