共 16 条
[4]
BARRY PJ, 1970, THESIS U ILLINOIS
[6]
HEADY EO, 1952, 388 IOW AGR EXP STA
[7]
HEADY EO, 1957, 447 IOW AGR EXP STA
[8]
HESSER LE, 1960, 703 IND AGR EXP STA
[10]
IRWIN GD, 1968, AGR ECON RES, V20, P82