Approximations to the distributions of the likelihood ratio statistics for testing certain structures on the covariance matrices of real multivariate normal populations

On the exact distributions of the extreme roots of the Wishart and MANOVA matrices

Krishnaiah, P. R., (1971)

Likelihood ratio tests for mean vectors and covariance matrices

Krishnaiah, P. R., (1980)

Inference on the eingenvalues of the covariance matrices of real and complex multivariate normal populations

Krishnaiah, P. R., (1977)