@article{00650833,
title = {Extremal problems for completely positive maps.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {17},
year = {1994},
pages = {607-608},
doi = {10.1155/S0161171294000852},
zbl = {0805.46058},
language = {en},
url = {http://dml.mathdoc.fr/item/00650833}
}
Yang, Mingze. Extremal problems for completely positive maps.. International Journal of Mathematics and Mathematical Sciences, Tome 17 (1994) pp. 607-608. doi : 10.1155/S0161171294000852. http://gdmltest.u-ga.fr/item/00650833/