@article{Łenski:2010,
author
=
"W.Łenski and B.Szal",
title
=
"On the degree of strong approximation of functions and conjugate functions",
journal
=
"Demonstratio Mathematica",
volume
=
"Vol. 43",
number
=
"no 1",
pages
=
"117--128",
year
=
"2010",
}