共 14 条
[1]
AVERDUNK G, 1984, APR EUR C BROWN CATT
[2]
Dickinson F. N., 1976, United States Department of Agriculture, Agricultural Research Service Production Research Report, P18
[3]
ETGEN WM, 1958, THESIS OHIO STATE U
[4]
NORMAN HD, 1974, NE40 USDADHIA AGR RE
[5]
PHILIPPSON J, 1984, SEP INT DAIR FED EUR
[7]
SMITH JW, 1962, THESIS N CAROLINA ST
[8]
SPALDING RW, 1961, THESIS OHIO STATE U
[9]
TURNER CW, 1924, MISSOURI AGR EXP STN, V217