Geodesic
The behavior of the discrepancies in the approximate solution of linear equations
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 5 
I. V. Emelin. The behavior of the discrepancies in the approximate solution of linear equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 5. http://geodesic.mathdoc.fr/item/RM_1972_27_5_a15/
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     author = {I. V. Emelin},
     title = {The behavior of the discrepancies in the approximate solution of linear equations},
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     year = {1972},
     volume = {27},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1972_27_5_a15/}
}
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[1] M. A. Krasnoselskii, G. M. Vainikko, P. P. Zabreiko, Ya. B. Rutitskii, V. Ya. Stetsenko, Priblizhennoe reshenie operatornykh uravnenii, «Nauka», M., 1969 | MR