Varouj A. Aivazian, Jeffrey L. Callen, Itzhak Krinsky, Clarence C. Y. Kwan, Mean-Variance Utility Functions and the Demand for Risky Assets: An Empirical Analysis Using Flexible Functional Forms, The Journal of Financial and Quantitative Analysis, Vol. 18, No. 4 (Dec., 1983), pp. 411-424