@article{02157451,
title = {Hermitian nonnegative-definite and positive-definite solutions of the matrix equation },
journal = {Applied Mathematics E-Notes [electronic only]},
volume = {4},
year = {2004},
pages = {40-47},
zbl = {1067.15009},
language = {en},
url = {http://dml.mathdoc.fr/item/02157451}
}
Zhang, Xian. Hermitian nonnegative-definite and positive-definite solutions of the matrix equation . Applied Mathematics E-Notes [electronic only], Tome 4 (2004) pp. 40-47. http://gdmltest.u-ga.fr/item/02157451/