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二级参考文献4
1Payne L N,Brown S R,Bumstead N,et al.A novel subgroup of exogenous avian leucosis virus in chickens[J].Gen Virol,1991,72:801～807.
2Payne L N,Gillespic A M,Howes K.Myeloid leukaemogenicity and transmission of the HRPS-103 strain of avian leukosis virus[J].Leukemia 1993,6:1167～1176.
3Guillermo Zavala,DVM,MAM,Dipl,ACPV,A new challenge for the poultry Industry-myeloid leukosis[J].Vineland Update,1998,61(4):665～668.
