<p><u><font color="#800080">1、</font></u></p><p><u><font color="#800080"><a href="http://qed.econ.queensu.ca/pub/faculty/abbott/econ452/">http://qed.econ.queensu.ca/pub/faculty/abbott/econ452/</a></font></u></p><p>2、<a href="http://teaching.fec.anu.edu.au/EMET8005/">http://teaching.fec.anu.edu.au/EMET8005/</a><a href="http://www.pinggu.org/bbs/thread-300981-1-1.html&page=1"></a></p>