@article{SM_1994_79_2_a4,
     author = {E. A. Kalita},
     title = {On singular points of solutions of nonlinear higher-order elliptic equations and systems},
     journal = {Sbornik. Mathematics},
     pages = {315--334},
     publisher = {mathdoc},
     volume = {79},
     number = {2},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1994_79_2_a4/}
}