@article{DAN_1974_218_1_a2,
     author = {V. V. Katrakhov},
     title = {On the theory of partial differential equations with singular coefficients},
     journal = {Doklady Akademii Nauk},
     pages = {17--20},
     publisher = {mathdoc},
     volume = {218},
     number = {1},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_218_1_a2/}
}