Key points are not available for this paper at this time.
Trina Grillo, Stephanie M. Wildman, Obscuring the Importance of Race: The Implication of Making Comparisons between Racism and Sexism (Or Other -Isms), Duke Law Journal, Vol. 1991, No. 2 (Apr., 1991), pp. 397-412
Grillo et al. (Mon,) studied this question.