共 8 条
[1]
BERG RT, 1976, NEW CONCEPTS CATTLE, P178
[5]
OLIVER WM, 1969, 12 TEX AGR EXP STA D
[6]
REID JT, 1968, 1598 NAT AC SCIENC P, P19
[7]
ROLLINS WC, 1972, HILGARDIA, V41, P435
[8]
1965, OFFICIAL METHODS ANA