@article{DAN_1991_316_3_a15,
     author = {S. I. Smagin},
     title = {A new class of integral equations that lower the dimension of},
     journal = {Doklady Akademii Nauk},
     pages = {580--585},
     publisher = {mathdoc},
     volume = {316},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_316_3_a15/}
}