@article{RM_1963_18_1_a0,
     author = {E. M. Landis},
     title = {Some problems of the qualitative theory of second order elliptic equations (case of several independent variables)},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1--62},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1963},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1963_18_1_a0/}
}