30.North, D.C.Economic Performance through Time.The American Economic Review, 1994, 84(3): 359-368.
31.Pissarides, C.A.Search Unemployment with On-the-job Search.Review of Economic Studies, 1994, 61: 457-475.
32.Pissarides, C.A.Short-Run Dynamics of Unemployment, Vacancies and Real Wages.American Economic Review, 1985, 75: 676-690.
33.Porter, M.E.The Competitive Advantage of Nations.Simon and Schuster, 1990.
