6Boyer, R. S. and Kingston, G. H. , 1987, "Currency substitution under finance constraints", Journal of International Money and Finance, 6, 235-50.
7Calvo, G. A., 1985, "Currency substitution and the real exchange rate: the utility maximization approach", Journal of International Money and Finance, 4, 175-88.
8Calvo, G. A. and Vegh, C. A., 1992, "Currency substitution in developing countries: an introduction", IMF Working Paper, May, 40, 1-27.
9Canzonerri, M. B. and Diba, B. T., 1992, "Tbe inflation discipline of currency substitution", European Economic Review, 36. 827-45.
10Girton, L. and Roper, D., 1981, "Theory and implications of currency substitution", Journal of Money, Credit, and Banking, Vol. 13, No. 1, 13-29.