@article{DAN_1962_143_2_a9,
     author = {V. V. Ryndina},
     title = {On the completeness of systems of analytic functions consisting of solutions of second-order differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {282--285},
     publisher = {mathdoc},
     volume = {143},
     number = {2},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_2_a9/}
}