Polyhedral Cone-Ratio DEA Models with an illustrative application to large commercial banks
Authors: A. Charnes, W. W. Cooper, Z. M. Huang, D. B. Sun
Journal of Econometrics, Volume 46, Issues 1-2, October-November 1990, Pages 73-91

Banks in Capital Markets,
Authors: Steven Drucker, Manju Puri
Handbook of Empirical Corporate Finance, Elsevier, San Diego, 2007, Pages 189-232,
ISBN 978-0-44-453265-7, DOI: 10.1016/B978-0-444-53265-7.50019-6.
http://www.sciencedirect.com/science/article/B8KRD-4WKCTJM-4/2/5cdf17db8d0a1dfe398dae06c205923f

Thnx in Advance