@article{TRSPY_1991_200_a28,
     author = {I. V. Skrypnik},
     title = {Regularity of a~boundary point for a~quasi-linear elliptic equation of higher order},
     journal = {Informatics and Automation},
     pages = {310--321},
     publisher = {mathdoc},
     volume = {200},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1991_200_a28/}
}