@article{DAN_1962_144_2_a10,
     author = {M. G. Shur},
     title = {The {Martin} boundary for linear, second-order elliptic operators},
     journal = {Doklady Akademii Nauk},
     pages = {290--292},
     year = {1962},
     volume = {144},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_2_a10/}
}