@article{RM_2023_78_3_a0,
     author = {A. R. Alimov and K. S. Ryutin and I. G. Tsar'kov},
     title = {Existence, uniqueness, and stability of best and near-best approximations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {399--442},
     publisher = {mathdoc},
     volume = {78},
     number = {3},
     year = {2023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2023_78_3_a0/}
}