1) Savage R.J.G., 1957. The anatomy of Potamotherium, an Oligocene lutrine. Proceedings of the Zoological Society of London, 129 (2): 151–244.
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http://www3.interscience.wiley.com/cgi-bin/abstract/122569584/ABSTRACT
2) Pocock R.I., 1916. The tympanic bulla in hyaenas. Proceedings of the Zoological Society of London, 86 (1): 303–307.
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http://www3.interscience.wiley.com/cgi-bin/abstract/122571572/ABSTRACT
3) Pocock R.I., 1921. The auditory bulla and other cranial characters in the Mustelidae. Proceedings of the Zoological Society of London, 91 (3): 473–486.
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http://www3.interscience.wiley.com/cgi-bin/abstract/122571390/ABSTRACT
4) Pocock R.I., 1935. The races of Canis lupus. Proceedings of the Zoological Society of London, 105 (3): 647–686.
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http://www3.interscience.wiley.com/cgi-bin/abstract/122570559/ABSTRACT
5) Thorpe M.R., 1922. Oregon Tertiary Canidae, with descriptions of new forms. American Journal of Science, Series 5, Vol. 3: 162–176.
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http://www.ajsonline.org/cgi/reprint/s5-3/15/162
