@article{SM_1967_1_2_a5,
     author = {E. M. Polishchuk},
     title = {Equations of {Laplace} and {Poisson} type in a function space},
     journal = {Sbornik. Mathematics},
     pages = {233--262},
     year = {1967},
     volume = {1},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1967_1_2_a5/}
}