1.
题目：Matching and agglomeration economies in a system of cities
作者：Robert W. Helsley，William C. Strange
期刊：Regional Science and Urban Economics，Volume 20, Issue 2, September 1990,Pages 189-212
链接：http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V89-45R2BXG-4&_user=1555909&_coverDate=09%2F30%2F1990&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1612515385&_rerunOrigin=scholar.google&_acct=C000053682&_version=1&_urlVersion=0&_userid=1555909&md5=0d60317833db53c3040b512dd72504e8&searchtype=a
2.
题目：Agglomeration economies and urban capital markets
作者：Robert W. Helsley，William C. Strange
期刊：Journal of Urban Economics，Volume 29, Issue 1, January 1991,Pages 96-112
链接：http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WMG-4D9PRS8-6M&_user=1555909&_coverDate=01%2F31%2F1991&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1612542154&_rerunOrigin=scholar.google&_acct=C000053682&_version=1&_urlVersion=0&_userid=1555909&md5=c07fc7d72d13a6b1355382f83a53c5b8&searchtype=a
谢谢！