Geodesic
Problem of mean-square approximation related to the investigation of generators of $l^1$ algebra
Matematičeskie zametki, Tome 3 (1968) no. 6, pp. 703-706.

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Weighted mean-square approximation is considered of analytic functions in Carathéodory domain. Conditions are established under which the function is a generator of the Banach algebra $l^1$. 
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     author = {F. S. Lisin},
     title = {Problem of mean-square approximation related to the investigation of generators of $l^1$ algebra},
     journal = {Matemati\v{c}eskie zametki},
     pages = {703--706},
     publisher = {mathdoc},
     volume = {3},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_3_6_a9/}
}
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F. S. Lisin. Problem of mean-square approximation related to the investigation of generators of $l^1$ algebra. Matematičeskie zametki, Tome 3 (1968) no. 6, pp. 703-706. http://geodesic.mathdoc.fr/item/MZM_1968_3_6_a9/