Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1991_49_4_a17, author = {Yu. L. Shmul'yan}, title = {A~question regarding inequalities between {Hermitian} operators}, journal = {Matemati\v{c}eskie zametki}, pages = {138--141}, publisher = {mathdoc}, volume = {49}, number = {4}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1991_49_4_a17/} }
Yu. L. Shmul'yan. A~question regarding inequalities between Hermitian operators. Matematičeskie zametki, Tome 49 (1991) no. 4, pp. 138-141. http://geodesic.mathdoc.fr/item/MZM_1991_49_4_a17/