@article{DAN_1962_146_6_a0,
     author = {N. I. Brisch and I. N. Valeshkevich},
     title = {The {Fourier} method for differential equations containing a second derivative with respect to the time},
     journal = {Doklady Akademii Nauk},
     pages = {1247--1250},
     publisher = {mathdoc},
     volume = {146},
     number = {6},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_146_6_a0/}
}