@article{DAN_1990_311_6_a5,
     author = {L. V. Kritskov},
     title = {Necessary conditions for a system of root functions of a one-dimensional {Schr\"odinger} operator to be a basis in $L_p(G)$},
     journal = {Doklady Akademii Nauk},
     pages = {1306--1309},
     publisher = {mathdoc},
     volume = {311},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_6_a5/}
}