MAP20080052645 Liebenberg, André P. Effects of corporate diversification : evidence from the property-liability insurance industry / André P. Liebenberg, David W. Sommer En: The Journal of risk and insurance. - Nueva York : The American Risk and Insurance Association, 1964- = ISSN 0022-4367. - 01/12/2008 Tomo 75 Número 4 - 2008 I. Sommer, David W. .