@article{DAN_1965_161_3_a9,
     author = {B. V. Rusanov},
     title = {Functionally invariant solutions of second-order equations},
     journal = {Doklady Akademii Nauk},
     pages = {534--537},
     publisher = {mathdoc},
     volume = {161},
     number = {3},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_161_3_a9/}
}