@article{Himmel:2017,
author
=
"M.Himmel and J.Matkowski",
title
=
"Beta-type functions and the harmonic mean",
journal
=
"Aequationes Mathematicae",
volume
=
"Vol. 91",
number
=
"iss. 6",
pages
=
"1041--1053",
year
=
"2017",
}