@article{IVM_1996_5_a7,
     author = {M. P. Kotukhov},
     title = {On some differential properties of solutions of a partial differential equation},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {59--62},
     year = {1996},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1996_5_a7/}
}