@article{DAN_1965_161_1_a2,
     author = {A. M. Bukhvalov},
     title = {An elementary method of separation of variables in equations of several variables},
     journal = {Doklady Akademii Nauk},
     pages = {16--18},
     publisher = {mathdoc},
     volume = {161},
     number = {1},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_161_1_a2/}
}