@article{DAN_1962_142_3_a18,
     author = {A. L. Krylov},
     title = {Models with finite numbers of degrees of freedom for a certain class of problems in mathematical physics 
},
     journal = {Doklady Akademii Nauk},
     pages = {572--575},
     publisher = {mathdoc},
     volume = {142},
     number = {3},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_142_3_a18/}
}