@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/}
}