Geodesic
Estimate of growth of Lebesgue functions of linear methods of summation
Matematičeskie zametki, Tome 6 (1969) no. 3, pp. 277-286.

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Sufficient conditions are obtained in terms of matrix elements for the boundedness of Lebesgue functions of linear methods of summation of expansions in orthogonal systems of polynomial type. 
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     author = {B. P. Osilenker},
     title = {Estimate of growth of {Lebesgue} functions of linear methods of summation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {277--286},
     publisher = {mathdoc},
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     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_3_a2/}
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B. P. Osilenker. Estimate of growth of Lebesgue functions of linear methods of summation. Matematičeskie zametki, Tome 6 (1969) no. 3, pp. 277-286. http://geodesic.mathdoc.fr/item/MZM_1969_6_3_a2/