@article{GDZPPN002462028,
title = {A Minimal Characterization of the Covariance Matrix.},
journal = {Metrika},
volume = {35},
year = {1988},
pages = {49-52},
zbl = {0638.62046},
url = {http://dml.mathdoc.fr/item/GDZPPN002462028}
}
Grübel, R. A Minimal Characterization of the Covariance Matrix.. Metrika, Tome 35 (1988) pp. 49-52. http://gdmltest.u-ga.fr/item/GDZPPN002462028/