@article{DAN_1976_226_3_a4,
     author = {I. I. Lyashko and V. P. Didenko},
     title = {On {Tihonov} regularization of problems with a symmetric operator in {Hilbert} spaces},
     journal = {Doklady Akademii Nauk},
     pages = {510--512},
     year = {1976},
     volume = {226},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_226_3_a4/}
}