@article{IVM_1968_9_a11,
     author = {A. Ya. Chilap},
     title = {A~conjugacy problem for equations of elliptic type},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {106--111},
     year = {1968},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_9_a11/}
}