@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/