Geodesic
Exact solutions of some approximation problems by means of positive operators
Matematičeskie zametki, Tome 48 (1990) no. 3, pp. 91-99.

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     author = {G. G. Magaril-Il'yaev},
     title = {Exact solutions of some approximation problems by means of positive operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {91--99},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_3_a11/}
}
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G. G. Magaril-Il'yaev. Exact solutions of some approximation problems by means of positive operators. Matematičeskie zametki, Tome 48 (1990) no. 3, pp. 91-99. http://geodesic.mathdoc.fr/item/MZM_1990_48_3_a11/