@article{ZNSL_2016_453_a9,
     author = {V. P. Il'in},
     title = {Least squares methods in {Krylov} subspaces},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {131--147},
     year = {2016},
     volume = {453},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2016_453_a9/}
}