@article{ZNSL_2022_514_a3,
     author = {V. P. Ilin},
     title = {Multigrid methods of incomplete factorization in {Krylov} subspaces},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {61--76},
     publisher = {mathdoc},
     volume = {514},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2022_514_a3/}
}