Multivariate Multiple Regression - multivariate tests

Hi guys, I need to really understand Wilks' Lambda, Roy's greatest root and other multivariate tests but IN THE CONTEXT OF MULTIVARIATE MULTIPLE REGRESSION(more than one response variable, with same design matrix (independent variables)), not manova nor discriminant analysis. I haven't found much in the books, except for Seber - Multivariate Observations. Does anyone know some other book or paper where I can study and understand this tests (with a good explanation of course)in the context of MULTIVARIATE MULTIPLE REGRESSION .

Regards, Axs