8W calnek,H John Barnes.Disease of poultry,tenth edition.Ames:Iowa state university press,1997
9Yoder H W.Nonspecific reactions 50 Mycoplasma serum plate antigens induced by inactivated poultry disease vaccine.Avian Dis,1989,33:60~68
10Kleven S H,CJMorrow,K G Whithear.Comparison of Mycoplasma gallisepticum strains by hemagglutiantion-inhibition and restriction endonuclease analysis.Avian Dis,1988,32:731~741