1. Van Thiel, P. H., Antonie van Leeuwenhoek, 14, 129 (1948).
2. Combiesco, D., Sturdza, N., Radu, I., Sefer, M., and Nicolesco, I., Arch. Roumaines Path. Exp. Microbiol., 18, 361 (1959). (Abstr. in Bull. Hyg., 35, 1006; 1960.)
3. Van der Hoeden, J., Syenberg, J. E., and Evenchik, Z., Nature, 190, 95 (1961).
4. White, F. H., Amer. J. Vet. Res., 24, 179 (1963).
5. Andrews, R. D., Reilly, J. R., Ferris, D. H., and Hansen, L. E., Bull. Wildlife Dis. Assoc., 1, 55 (1965).