共 24 条
[3]
CHAMBERS JM, 1967, BIOMETRIKA, V54, P367
[4]
Domencich T., 1975, URBAN TRAVEL DEMAND, P155
[6]
GOLDBERGER AS, 1980, 8006 U WISC SOC SYST
[8]
HECKMAN J, 1980, EVALUATION STUDIES R, P69
[9]
HECKMAN JJ, 1976, ANN ECON SOC MEAS, V5, P475
[10]
KING MA, 1980, 248 U BIRM DEP EC A

