共 19 条
[1]
ALMUTAIRI N, 1995, J SAUD U, V7, P3
[2]
BURNEY NA, 1996, ENERG ECON, V18, P67
[4]
CAVES DW, 1981, AM ECON REV, V71, P994
[5]
CAVES DW, 1988, LOGIST TRANSPORT REV, V24, P3
[9]
GOLLOP F, 1983, J POLITICAL EC, V49, P654