1. Atanasiu P, Gamet A, Guillon JC, Lepine P, Levaditi JC, Tsiang H, Valee A (1971) Pathol Biol 19:207
2. Aubert MFA (1982) Comp Immun Microbiol infect Dis 5:369
3. Beauregard M, Boulanger P, Webster WA (1965) Can J Comp Med Vet Sci 29:141
4. Blancou J, Andral L (1982) Comp Immun Microbiol infect. Dis 5:95
5. Blenden DC, Frost JW, Wachendörfer G (1980) Zbl Vet Med B27:698