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Translated from Matematicheskie Zametki, Vol. 54, No. 3, pp. 72–88, September, 1993.
The authors would like to express sincere gratitude to A. A. Samarskii for consistent attention to this work and for his useful discussion.
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Kucherov, A.B., Makarov, M.M. A study of the method of approximate factorization for solving grid elliptic boundary-value problems. Math Notes 54, 923–933 (1993). https://doi.org/10.1007/BF01209557
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DOI: https://doi.org/10.1007/BF01209557