@article{DE_1977_13_2_a5,
     author = {A. M. Abdrakhmanov},
     title = {Elliptic systems that are degenerate at a point},
     journal = {Differencialʹnye uravneni\^a},
     pages = {276--284},
     publisher = {mathdoc},
     volume = {13},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_2_a5/}
}