@article{DAN_1966_168_1_a5,
     author = {V. R. Portnov},
     title = {The first boundary value problem for a class of equations and systems},
     journal = {Doklady Akademii Nauk},
     pages = {28--31},
     publisher = {mathdoc},
     volume = {168},
     number = {1},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_168_1_a5/}
}