<p>1&nbsp; 1982. Heterogeneity and State Dependence, NBER Reprints 0298</p><p><a href="http://ideas.repec.org/p/nbr/nberre/0298.html">http://ideas.repec.org/p/nbr/nberre/0298.html</a></p><p>2 &nbsp;Sending Farmers Back to School: The Impact of Farmer Field Schools in Indonesia</p><p><a href="http://econpapers.repec.org/article/blaragrec/v_3A26_3Ay_3A2004_3Ai_3A1_3Ap_3A45-62.htm">http://econpapers.repec.org/article/blaragrec/v_3A26_3Ay_3A2004_3Ai_3A1_3Ap_3A45-62.htm</a></p><p>本文来自: 人大经济论坛(<a href="http://www.pinggu.org">http://www.pinggu.org</a>) 详细出处参考：<a href="http://www.pinggu.org/bbs/thread-302730-1-1.html&amp;page=1">http://www.pinggu.org/bbs/thread-302730-1-1.html&amp;page=1</a></p>