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2. Reversion to virulence of attenuated canine distemper virus in vivo and in vitro;Appel;J. Gen. Virol.,1978
3. Canine infectious tracheobronchitis (kennel cough): A status report;Appel;Compend. Contin. Ed. Pract. Vet.,1981
4. Pathogenicity of low-virulence strains of two canine adenovirus types;Appel;Am. J. Vet. Res.,1973
5. Morbillivirus diseases of animals and man;Appel,1981