@article{RM_2006_61_6_a10,
     author = {M. E. Shirokov},
     title = {Superadditivity of~the~convex~closure of~the~output entropy of~a~quantum channel},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1186--1188},
     publisher = {mathdoc},
     volume = {61},
     number = {6},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2006_61_6_a10/}
}