@article{GDZPPN002464829, title = {Invariance of Covariance Structures Under Groups of Transformations.}, journal = {Metrika}, volume = {38}, year = {1991}, pages = {345-355}, zbl = {0757.62004}, url = {http://dml.mathdoc.fr/item/GDZPPN002464829} }
Shapiro, A.; Browne, M.W. Invariance of Covariance Structures Under Groups of Transformations.. Metrika, Tome 38 (1991) pp. 345-355. http://gdmltest.u-ga.fr/item/GDZPPN002464829/