8Christopoulos D. K. and E. G. Tsionas, 2004, "Financial Development and Economic Growth: Evidence from Panel Unit Root and Cointegration Tests," Journal of Development Economics, 73, 55-74.
9Engle R. F, and C. W. J. Granger, 1987, "Cointegrafion and Error Correction Representation: Estimation and Testing," Econometrics, 55, 251-276.
10Engle R. F, and S. B. Yoo, 1987, "Forecasting and Testing in Co-integrated Systems," Journal of Econometrics. 35, 143- 159.