@article{DAN_1962_147_3_a11,
     author = {A. G. Teterev},
     title = {Extremal properties of solutions of elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {559--561},
     publisher = {mathdoc},
     volume = {147},
     number = {3},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_147_3_a11/}
}