@article{FAA_1986_20_2_a15,
     author = {N. Ya. Krupnik},
     title = {Exact constant in {Simonenko's} theorem on an envelope of a family of operators of local type},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {70--71},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1986_20_2_a15/}
}