Geodesic
Absolute summability of orthogonal series by $(\varphi,\lambda)$ methods
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1991), pp. 25-36.

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@article{IVM_1991_11_a5,
     author = {O. A. Ziza},
     title = {Absolute summability of orthogonal series by $(\varphi,\lambda)$ methods},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {25--36},
     publisher = {mathdoc},
     number = {11},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1991_11_a5/}
}
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%T Absolute summability of orthogonal series by $(\varphi,\lambda)$ methods
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%G ru
%F IVM_1991_11_a5
O. A. Ziza. Absolute summability of orthogonal series by $(\varphi,\lambda)$ methods. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1991), pp. 25-36. http://geodesic.mathdoc.fr/item/IVM_1991_11_a5/