@article{DAN_1962_143_3_a5,
     author = {P. D. Kalafati},
     title = {Oscillatory properties of the fundamental functions of third-order boundary-value problems},
     journal = {Doklady Akademii Nauk},
     pages = {518--521},
     publisher = {mathdoc},
     volume = {143},
     number = {3},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_3_a5/}
}