GUPTA, A. K., D. K. NAGAR, and V. TAYAL. “NONNULL DISTRIBUTION OF LRC FOR TESTING HOMOGENEITY OF COVARIANCE MATRICES OF COMPLETELY SYMMETRIC GAUSSIAN MODELS”. Tamkang Journal of Mathematics, vol. 22, no. 1, Mar. 1991, pp. 13-24, doi:10.5556/j.tkjm.22.1991.4563.