@article{MZM_1990_47_2_a21,
     author = {G. A. Trunov},
     title = {An estimate for a~spectral relation for incomplete factorization of the form $S^*S$ of the difference approximation of the {Laplace} operator in the case of a~quasiregular operator~$S$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {155--156},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_2_a21/}
}