26. 26-Ashby, N. J. (2007). ‘economic freedon and migration flow between U.S. States’ , southern economic journal, 73 (3) 27. 27-Bang, J. T. and M. mitra, (2011). ‘brain drain and institutions of govermane: educational attainment of immigrants to the US1988-1998’, economic systems, 35(3). 28. 28-Entezarkher, M. (2005). ‘ Why is iran experiencing Migration and brain drain to Canada?’, gospodarskateza, university of waterloo. 29. 29-Ghafari, R. and Torki Harchegani, M. (2010). Analysis of effective factors of migration of rural youth to urban arareas (case study: sadiq abad from saman distrect in charmahal bakhtiari province ). Housing and rural environment, 132: 91-102 (in persian) 30. 30-Holzar, H(2009), The migration and social development, UK, Ld, Oxford 31. 31-Shams –al-dini, A. and Gorjian, P.(2010). Effective factors on migration of villagers to urban arareas, with emphasis on migration network (case study: Rostam no village). Geogaphical perspective, 5(11): 75-92. (in persian) 32. 32-Ziari, K. (2008), the operation khoy city in space development in west azarbayajan province, geography reaserch, no63, Tehran university, pp 15-35
|