Geodesic
On nondetermined methods of solving Poisson’s equation optimal on function classes
Doklady Akademii Nauk, Tome 189 (1969) no. 4, pp. 744-747 
A. F. Shapkin. On nondetermined methods of solving Poisson’s equation optimal on function classes. Doklady Akademii Nauk, Tome 189 (1969) no. 4, pp. 744-747. http://geodesic.mathdoc.fr/item/DAN_1969_189_4_a13/
@article{DAN_1969_189_4_a13,
     author = {A. F. Shapkin},
     title = {On nondetermined methods of solving {Poisson{\textquoteright}s} equation optimal on function classes},
     journal = {Doklady Akademii Nauk},
     pages = {744--747},
     year = {1969},
     volume = {189},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_189_4_a13/}
}
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