Geodesic
On a~criterion for an element of best $(\alpha,\beta)$-approximation in the space of summable functions
Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 201-202.

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@article{TRSPY_1987_180_a122,
     author = {G. S. Smirnov},
     title = {On a~criterion for an element of best $(\alpha,\beta)$-approximation in the space of summable functions},
     journal = {Informatics and Automation},
     pages = {201--202},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a122/}
}
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G. S. Smirnov. On a~criterion for an element of best $(\alpha,\beta)$-approximation in the space of summable functions. Informatics and Automation, Theory of functions and related questions of analysis, Tome 180 (1987), pp. 201-202. http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a122/