@article{ZNSL_1987_157_a16,
     author = {M. M. Malamud},
     title = {Some analogues of {von-Heumann's} inequality for $J$-contractions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {165--172},
     publisher = {mathdoc},
     volume = {157},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_157_a16/}
}