6Michael P Todaro A Model Of Labor Migration And Urban Unemployment In Less Developed Countries The American Economic Review v59 p138—48,1969.
7Yaohui Zhao Labor Migration And Earnings Differences:The Case Of Rural China Economic Development And Cultural Change 1999 v47,n4,p767.
8ThomasKrichel,Paul Levine The welfare Economies of Rural-to-urban Migration:theHarris—Todaromodel revisited.Journal of Regional Science,1999,v39,n3,p429.
