Key points are not available for this paper at this time.
Gershon N. Mandelker, S. Ghon Rhee, The Impact of the Degrees of Operating and Financial Leverage on Systematic Risk of Common Stock, The Journal of Financial and Quantitative Analysis, Vol. 19, No. 1 (Mar., 1984), pp. 45-57
Mandelker et al. (Thu,) studied this question.