@article{Łenski:2009,
author
=
"W.Łenski and B.Szal",
title
=
"Pointwise strong and very strong approximation by matrix means of Fourier series",
journal
=
"Annales Societatis Mathematicae Polonae : Commentationes Mathematicae : Series I",
volume
=
"Vol. 48",
number
=
"no 2",
pages
=
"177--198",
year
=
"2008",
}