7Benston, G. J., 1965: "Branch banking and economies of scale" , Journal of Finance, 312-331.
8Beston, J.A., Hanweek, G. A, Humphrey, 1982:"Scale of economies in banking: A reconstruction reassessment". Journal of Money, Credit and Banking, 14, 435-456.
9Berger, A. N., Humphrey, D. B., 1997: "Efficiency of financial institutions: International survey and directions for future research" , European Journal of Operational Research 98 175-212.
10Edwards, F. R., Heggestad A. A., 1973: "Uncertainty, market structure and performance: the Galbraith-Caves hypothesis and managerial motives in banking", Quarterly Journal of Economics, 87, 455-473.