@article{DAN_1960_133_2_a14,
     author = {A. V. Astakhov},
     title = {A contribution to the proof of double spectral representations},
     journal = {Doklady Akademii Nauk},
     pages = {307--310},
     publisher = {mathdoc},
     volume = {133},
     number = {2},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_133_2_a14/}
}