@article{DE_1969_5_9_a18,
     author = {V. G. Klimenko and V. L. Rvachev},
     title = {The completeness with respect to energy of systems of coordinate functions which one constructs by the method of $R$-functions},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1724--1726},
     publisher = {mathdoc},
     volume = {5},
     number = {9},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_9_a18/}
}