1Dickey, D. A. and Fuller, W. A. 1979 Distribution of the estimators for auto-regressive time series with a unit root, Journal of the American Statistical Association, Vol.74: PP427-431.
2Durbin, J. and Watson, G. S. 1951 Testing for serial correlation in least -squares regression,Biometrika, Vol.38: PP159-171.
3Griffith, W. E., Carter H. R. and Judge, G. G.1993 Learning and Practicing Econometrics, New York: John Wiley & Sons.
4Krugamn, P. 1991 Geography and Trade, Cambridge, Mass.: The MIT Press.
5Kuznets, S. 1966 Modern Economic Growth, New Haven, Conn: Yale University Press.
6Nelson, C. R. and Plosser, C. I. 1982 Trends and random walks in macroeconomic time series,Journal of Monetary Economics, Vol. 10: PP139-162.
7Nelson, C. R. and Plosser, C. I. 1982 Trends and random walks in macroeconomic time series:some evidence and implications, Journal of Monetary Economics, Vol.10: PP139-162.