共 20 条
[11]
*NCRE PROJ, 1990, ANN REP RES ACT 1989
[14]
PAGIOLA S, 1991, UNPUB USE COST BENEF
[15]
Pearson Scott., 1995, AGR POLICY KENYA APP
[16]
SMITH J, 1993, SOCIAL SCIENCE RESEARCH FOR AGRICULTURAL TECHNOLOGY DEVELOPMENT, P144
[17]
SPENCER DSC, 1991, AGRICULTURAL SUSTAINABILITY, GROWTH, AND POVERTY ALLEVIATION : ISSUES AND POLICIES, P273
[18]
SUMBERG JE, 1987, ILCA B, V28, P2
[20]
YAMOAH CF, 1993, P 3 N AM AGR C 16 18, P137