@article{DAN_1970_193_4_a5,
     author = {T. G. Pletneva and S. D. \`Eidel'man},
     title = {The summability of positive solutions of elliptic equations of arbitrary order},
     journal = {Doklady Akademii Nauk},
     pages = {760--763},
     publisher = {mathdoc},
     volume = {193},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_193_4_a5/}
}