18. Liggitt M. D.: Veterinary Clinics of North America: Food Animal Practica 1, 2, 347, 1985.
19. Nocerini M. R., Carlson J. R., Yost G. S., Breeze R. G., Liberato D. L.: XIV World Congress on Diseases of Cattle, Dublin 1986, 524.
20. Pringle J. K., Viel L.: XIV World Congress on Diseases of Cattle, Dublin 1986, 513.
21. Pritehard D. G., Carpentier C. A., Morazia J. P., Harkness J. W., Richerds M. J., Brewer J. F.: Vet. Rec. 109, 5, 1982.
22. Raynaud J. P., Espinasse J., Viso M., Tixier G., Allaire R.: XIV World Congress on Diseases of Cattle, Dublin 1986, 435.
23. Selman I. E., Allan E. M., Dalgleish R. G., Gibbs H. A., Shoo M. K., Wiseman A., Young W. В.: XIV World Congress of Diseases of Cattle, Dublin 1986, 606.
24. Soissons J., Mormede P., Bluthe R. M., Danzer R.: 12th World Congress on Diseases of Cattle, Amsterdam 1982, 1208.
25. Viso M., Espinasse J., Bencheikh-Lefgoun D., Haffar A., A., Fedida M.: XIV World Congress on Diseases of Cattle, Dublin 1986, 475.
26. Viso M., Espinasse J., Laval A.: Recl. Med. Vet. 159, 1059, 1983.
27. Viso M., Lambert P., Espinasse J., Delvaux G.: 12th World Congress on Diseases of Cattle, Amsterdam 1982, 87.
28. Yilma T., Breeze R. G.: Veterinary Clinics of North America: Food Animals Praectice l, 2, 419, 1973.
29. Zimmer G. M., Kimman T. J., Leeuw P. W., Staver P. J.: XIV World Congress on Diseases of Cattle, Dublin 1986, 501.