@article{Łenski:2018,
author
=
"W.Łenski and B.Szal",
title
=
"Pointwise approximation of 2\pi/r-periodic functions by matrix operators of their Fourier series with r-differences of the entries",
journal
=
"Demonstratio Mathematica",
volume
=
"Vol. 51",
number
=
"iss. 1",
pages
=
"309--322",
year
=
"2018",
}