@article{DE_1985_21_12_a3,
     author = {V. R. Kardashov},
     title = {A nonlinear spectral problem that generates a complete system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2052--2057},
     publisher = {mathdoc},
     volume = {21},
     number = {12},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_12_a3/}
}