2Fiess, N M, Fugazza, M, and Maloney, W F. Informal self employment and macroeeonomic fluctuations[J]. Journal of Develpment Economics, 2010, 91(2): 211-226.
3Thurik, A R, Carree, M, van Stel, A, and Audretsch, D B. Does self-employment reduce unemployment? [J]. Journal of Business Venturing, 2008, 23(6): 673-686.
4Reynolds, P D, Camp, S M, Bygrave, W D, Autio, E, and Hay, M. GEM Global 2009 executive report[R]. Kauffman Center for Entrepreneurial Leadership, 2009.
5Verheul, I, van Steh A, Thurik, A R, and Urbano, D. The relationship between business ownership and unemployment in Spain: A matter of quantity or quality? [J]. gstudios de Eeonomia Aplicada, 2006, 24(2) :105-127.
6Golpe, A, and van Stel, A. Self-employment and unemployment in Spanish regions in the period 1979-2001[A]. in Emilio Gongregado(Ed. ). Measuring entrepreneurship= Building a statistic system[C]. New York: Springer US, 2008.
7Fritsch, M, and Noseleit, F. Start-ups, new business employment, and the effects on incumbents: Who contrihutes the larger share? [R]. Jena Economic Research Papers, No 2008-068, 2008.
8Baptista, R, and Thurik, A R. The relationship between entrepreneurship and unemployment: Is Portugal an outlier? [J]. Technological Forecasting & Social Change, 2007, 74(1):75-89.
9van Stel, A, and Suddle, K. The impact of new firm formation on regional development in the Netherlands[J]. Small Business Economics, 2008, 30(1): 31-47.
10Baptista, R, Scaria, V, and Madruga, P. Entrepreneurship, regional development and job creation: The case of Portugal[J]. Small Business Economics, 2008, 30(1): 49-58.