The problem of calculating a perturbed inverse matrix as a convergent product
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 33 (1993) no. 4, pp. 624-631

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     author = {S. A. Shishkin},
     title = {The problem of calculating a perturbed inverse matrix as a convergent product},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {624--631},
     publisher = {mathdoc},
     volume = {33},
     number = {4},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1993_33_4_a10/}
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S. A. Shishkin. The problem of calculating a perturbed inverse matrix as a convergent product. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 33 (1993) no. 4, pp. 624-631. http://geodesic.mathdoc.fr/item/ZVMMF_1993_33_4_a10/