2Kevin J. Stiroh. Diversification in Banking-Is Noninterest Income the answer? [J]. Research Of- ricer, Federal Reserve Bank of New York, 2002.
3Shaffer,SheriU.Potentials Synergies among Large Commercial Banks [J].Federal Reserve Bank of Philaddphia,2009 (10) :91-107.
4Pasiouras,F. "Estimating the Technical and scale Efficiency of Greek Commercial Banks:the Impact of Credit Risk, Off-balance Sheet Activities,and International Operations" [J].Research in Interna- tional Business and Finance,2008(22):301-318.