共 14 条
[1]
BIERI J, TO BE PUBLISHED
[3]
CURRY M, 1971, ECON J, V81, P741
[4]
HUETH D, 1972, Q J ECON, V86, P351
[7]
MASSELL BF, 1969, Q J ECON, V83, P285
[9]
OLSON RO, 1960, J FARM ECON, V62, P1042
[10]
SAMUELSON PA, 1972, Q J ECON, V86, P476