@article{DAN_1957_115_4_a9,
     author = {S. A. Tersenov},
     title = {An elliptical type of equation degenerating at the domain boundary},
     journal = {Doklady Akademii Nauk},
     pages = {670--673},
     publisher = {mathdoc},
     volume = {115},
     number = {4},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_115_4_a9/}
}