共 13 条
[1]
ASCHAFFENBURG R., 1959, Int. Dairy Congr., V5, P1631
[2]
BLACKBURN P. S., 1959, BRIT VET JOUR, V115, P311
[5]
BLACKBURN PS, 1952, THESIS U GLASGOW
[7]
DAVIDSON I, 1961, Vet Rec, V73, P1015
[9]
MCFARLANE D., 1949, Veterinary Record, V61, P807
[10]
van RENSBURG S. W. J., 1947, ONDERSTEPOORT JOUR VET SCI AND ANIMAL INDUST, V22, P91