Hossein Khan Nazer, A., Dadras, H., Tamaddoni Jahromi, H. (1994). 'b-Lactamase Production in Ampiciliin Resistant Strains oi Enterobacteriaceae Isolated from Poultry.', Veterinary Research & Biological Products, 7(3), pp. 93-99. doi: 10.22092/vj.1994.112554