共 18 条
[1]
ANDERSON RJ, 1970, 264 I RES BEH EC MAN
[4]
Clawson M., 1966, ECONOMICS OUTDOOR RE
[6]
Davis OA, 1967, AM ECON REV, V57, P360
[7]
DAVIS RK, 1963, NAT RESOUR J, V3, P239
[8]
ENGEL JF, 1968, CONSUMER BEHAVIOR
[10]
ETTINGER H, 1971, LADC12197 LOS AL SCI