共 17 条
[2]
Cowan ST., 1974, COWAN STEELS MANUAL, V2, P67
[3]
Engel H W, 1974, Tijdschr Diergeneeskd, V99, P1162
[4]
ERICKSON ED, 1984, J AM VET MED ASSOC, V185, P666
[6]
Hahn G., 1970, Kieler Milchwirtschaftliche Forschungsberichte, V22, P333
[7]
HOMMEZ J, 1984, 8TH P IPVS C GHENT, P134
[9]
KOEHNE G, 1979, AM J VET RES, V40, P1640
[10]
Kunter E, 1976, Arch Exp Veterinarmed, V30, P211