@article{MZM_1976_20_3_a6,
     author = {S. S. Titov},
     title = {Representation of solutions of linear partial differential equations in the form of finite sums},
     journal = {Matemati\v{c}eskie zametki},
     pages = {359--363},
     publisher = {mathdoc},
     volume = {20},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_20_3_a6/}
}