@article{ZNSL_1971_22_a2,
     author = {S. V. Gurov},
     title = {Duality and isomorphism of spaces of solutions of elliptic equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {28--35},
     year = {1971},
     volume = {22},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_22_a2/}
}