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Consolidation and efficiency in the US life insurance industry[J] . J.David Cummins,Sharon Tennyson,Mary A. Weiss.Journal of Banking and Finance . 1999 (2)
[10]
Comparison of Frontier Efficiency Methods: An Application to the U.S. Life Insurance Industry[J] . J. David Cummins,Hongmin Zi.Journal of Productivity Analysis . 1998 (2)