共 12 条
[1]
BAILEY G. L., 1953, Int. Dairy Congr., V2, P76
[2]
BRANDT AE, 1938, 234 IOW STAT COLL RE
[3]
CLOUGH P., 1964, Agriculture, V71, P361
[4]
DODD FH, 1960, INT HOLIDAY COURSE Y
[5]
Elliott G. M., 1959, Dairy Science Abstracts, V21, P435
[8]
OLIVER J, 1955, DAIRY SCI ABSTR, V17, P354
[9]
OLIVER J, 1955, DAIR SCI ABSTR, V17, P447