共 15 条
[4]
DERBYSHIRE JC, 1966, J DAIRY SCI, V49, P716
[6]
KEULS M, 1952, EUPHYTICA, V1, P113
[7]
Kirchmayer M., 1965, Rocznik nauk rolniczych. Seria B. Zootechnika, V85, P265
[8]
Larson K. L., 1970, North Dakota Farm Research, V27, P11