@article{MMO_1966_15_a12,
     author = {I. S. Iokhvidov and M. G. Kreǐn},
     title = {Letter to the editor},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {452--454},
     publisher = {mathdoc},
     volume = {15},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1966_15_a12/}
}