@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/}
}