Geodesic
Summability of orthogonal series by some linear methods
Matematičeskie zametki, Tome 5 (1969) no. 6, pp. 753-762.

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Classes of matrix methods are given which sum the orthogonal series satisfying classical coefficient conditions of Men'shov–Kaczmarz, of Zygmund and of Alexits. The literature contains seven titles. 
@article{MZM_1969_5_6_a13,
     author = {Yu. M. Shmandin},
     title = {Summability of orthogonal series by some linear methods},
     journal = {Matemati\v{c}eskie zametki},
     pages = {753--762},
     publisher = {mathdoc},
     volume = {5},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_6_a13/}
}
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Yu. M. Shmandin. Summability of orthogonal series by some linear methods. Matematičeskie zametki, Tome 5 (1969) no. 6, pp. 753-762. http://geodesic.mathdoc.fr/item/MZM_1969_5_6_a13/