@article{MZM_2019_105_3_a7,
     author = {A. S. Leonov},
     title = {Methods for solving ill-posed extremum problems with optimal and extra-optimal quality},
     journal = {Matemati\v{c}eskie zametki},
     pages = {406--420},
     publisher = {mathdoc},
     volume = {105},
     number = {3},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2019_105_3_a7/}
}