References
- Kouwenhoven , B. , Davelaar , F.G. , Burger , A.G. and Lutticken , D. Significance of variant IB serotype in the Netherlands . Proceedings, No. 66 The International Union of Immunological Societies. Disease Prevention and Control in Poultry Production . August 31-September 2 1983 , Sydney.
- Locher , Maria , Lohr , J.E. and Kosters , J. 1983 . Comparative serological studies of avian infectious bronchitis vaccine strains and South German field isolates in tracheal organ cultures (Vergleichended serologische untersuchungen von suddeutschen feldistoiaten des virus der infektisen bronchitis der huhner und von impfstammen in trachealkulturen.) . Berl. Munch. Tierarztl. Wschr. , 96 : 269 – 274 .
- Lohr , J.E. 1986 . The occurrence of serum neutralising antibodies against several variant strains of the infectious bronchitis virus in South Wurttemberg. (Die verbreitung serumneutralisierender antikorper gegen verschiendene variantstamme des virus der infektionsen bronchitis des huhnes in Sud-Wurttenberg.) . Berl. Munch. Tierarztl. Wschr. , 99 : 411 – 414 .