@article{TRSPY_1985_172_a23,
     author = {A. P. Terekhin},
     title = {Multiplicative estimates of moduli of mixed operator smoothness},
     journal = {Informatics and Automation},
     pages = {325--337},
     publisher = {mathdoc},
     volume = {172},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1985_172_a23/}
}