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Otto M. Radostits, David A. Ashford, Craig E. Greene, Ian Tizard, et al., 2011, Canine Distemper (Hardpad Disease), in The Merck Manual for Pet Health (online): Pet Owners: Dog Disorders and Diseases: Disorders Affecting Multiple Body Systems of Dogs, see [2]Archived 2014년 12월 16일 - 웨이백 머신, accessed 15 December 2014.
Otto M. Radostits, David A. Ashford, Craig E. Greene, Ian Tizard, et al., 2011, Canine Distemper (Hardpad Disease), in The Merck Manual for Pet Health (online): Pet Owners: Dog Disorders and Diseases: Disorders Affecting Multiple Body Systems of Dogs, see [2]Archived 2014년 12월 16일 - 웨이백 머신, accessed 15 December 2014.
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