共 15 条
[2]
CARMER AG, 1963, AGRON J, V55, P387
[4]
FREEMAN AE, 1960, J DAIRY SCI, V43, P876
[6]
GAUNT S. N., 1966, XVIIth int. Dairy Oongr., VA, P29
[8]
KENDRICK JE, 1955, ARS511