by Chang Guoquan, Yang Shenghua (Veterinary Coll. of PLA, Changchun (China). Inst. of Military Veterinary Medicine)
Published in Bulletin of Veterinary College of PLA (China) (01.03.1993)

by Chang Guoquan, Yang Shenghua (PLA Univ. of Agriculture and Animal Science, Changchun (China). Inst. of Military Veterinary Medicine)
Published in Chinese Journal of Animal and Poultry Infectious Diseases (China) (01.03.1996)

by Chang Guoquan, Yang Shenghua (PLA, Veterinary Univ., Changchun, Jilin (China). Inst. of Military Veterinary)
Published in Chinese Journal of Veterinary Science and Technology (China) (01.01.1993)

by Chang Guoquan, Yang Shenghua (University of Agriculture and Animal Sciences of PLA, Changchun (China). Inst. of Military Veterinary Medicine)
Published in Xumu yu shouyi (01.11.1994)

by Chang Guoquan, Yang Shenghua (PLA Univ. of Agriculture and Animal Sciences, Changchun (China). Inst. of Military Veterinary Medicine)
Published in Chinese Journal of Animal and Poultry Infectious Diseases (China) (01.09.1994)

by Chang Guoquan, Yang Shenghua (Jilin Univ. of Agriculture and Animal Husbandry, Changchun (China). Inst. of Military Veterinary Medicine)
Published in Chinese Journal of Animal and Poultry Infectious Diseases (China) (01.09.1993)