共 15 条
[1]
DAVIS OA, 1964, KYKLOS, V17, P419
[2]
DAY JC, 1969, THESIS U WISCONSIN
[3]
DAY RH, 1964, LP90 USDA EC RES SER, P51
[10]
SHEAFFER JR, 1960, 65 U CHIC DEP GEOGR