2. Beyer J., Leopoldi D., Jange E., Stepanek J., Hornich M., Mensik J.: Mh. Vet. Med. 39, 547, 1984.
3. Black J. W.: Proc. US Anim, Health Ass. 75, 492, 1971.
4. Bohl E. H.: Coronaviruses: Diagnosis of Infections, w: Comparative Diagnosis of Viral Diseases, t. 4, wyd. Kurstak E. i Kurstak C. Academic Press New York 1981, s. 301.
5. Bohl E. H.: Diagnosis of Diarrhea in Pigs due to Transmissible Gastroenteritis Virus or Rotavirus, w: Viral Enteritis in Humans and Animals, wyd. Bricout F., Scherrer R., INSERM, Paris 1979, s. 341.
6. Brown J., Cartwright S.: Vet. Rec. 119, 282, 1986.