@article{DAN_1989_309_6_a8,
     author = {V. A. Rukavishnikov},
     title = {Differential properties of an $R_\nu$-generalized solution of},
     journal = {Doklady Akademii Nauk},
     pages = {1318--1320},
     publisher = {mathdoc},
     volume = {309},
     number = {6},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_6_a8/}
}