@article{DAN_1991_321_3_a4,
     author = {A. S. Leonov},
     title = {On the accuracy of {Tikhonov} regularizing algorithms and the},
     journal = {Doklady Akademii Nauk},
     pages = {460--465},
     publisher = {mathdoc},
     volume = {321},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_321_3_a4/}
}