@article{Łenski:2009,
author
=
"W.Łenski",
title
=
"Pointwise strong and very strong approximation of Fourier series",
journal
=
"Acta Mathematica Hungarica",
volume
=
"Vol. 115",
number
=
"no 3",
pages
=
"215--233",
year
=
"2007",
}