2N.Mauo al Turkey rhinotracheitis virus and E. coli experinent infection in chickens:histopathological、immunocytochemical and microbiological study Vet. Mirco. 1997,57:29-40
3A.J.Morley and D.K.Thomson Swollen-Head Syndrome in Broier Chickens AVIAN DISEASES 1983,28 (1) :87-88
4S.B.Buys al. Theisolation and attenuation of avirus causing rhinotracheitis in south africa Vet. Res.1989,56:87-89
