@article{ZNSL_1984_139_a6,
     author = {S. G. Mikhlin},
     title = {Errors of solutions of linear algebraic systems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {94--110},
     publisher = {mathdoc},
     volume = {139},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_139_a6/}
}