@article{DAN_1974_217_1_a9,
     author = {E. V. Shchepin},
     title = {On a problem of {L.} {A.~Tumarkin}},
     journal = {Doklady Akademii Nauk},
     pages = {42--43},
     year = {1974},
     volume = {217},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_217_1_a9/}
}