8Boyd, J., Hanweck , G., and Pithyachariyakul, P., 1980. Bank Holding Company Diversification, Proceeding from a Conference on Bank Structure and Competition[J]. Federal Reserve Bank of Chicago, (May) : 105-120.
9Cahnes, and Liu,Y., 2009. Financial Structure Change and Banking Income:A Canada-U. S. Comparison[J]. Journal of International Financial Markets, (19) : 128-139.
10Carvallo, O.,and Kasman, A., 2005. Cost Efficiency in the Latin American and Caribbean Banking Systems[J]. Journal of International Financial Markets,Institutions and Money, (15):55-72.