Geodesic
Rearrangements of summable numerical series
Matematičeskie zametki, Tome 13 (1973) no. 1, pp. 13-20.

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In this paper we obtain the necessary and sufficient conditions on permutations of numerical series which transformed any $B$-summable series into an $A$-summable series, where $A$ and $B$ are matrices satisfying certain conditions. 
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     author = {D. Sabo},
     title = {Rearrangements of summable numerical series},
     journal = {Matemati\v{c}eskie zametki},
     pages = {13--20},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_1_a1/}
}
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D. Sabo. Rearrangements of summable numerical series. Matematičeskie zametki, Tome 13 (1973) no. 1, pp. 13-20. http://geodesic.mathdoc.fr/item/MZM_1973_13_1_a1/