@article{DAN_1972_204_1_a15,
     author = {V. D. Krivchenkov and V. D. Kukin},
     title = {On equidistance of energy levels of {Schr\"odinger} one-dimensional equation},
     journal = {Doklady Akademii Nauk},
     pages = {60--62},
     publisher = {mathdoc},
     volume = {204},
     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_204_1_a15/}
}