@article{Matkowski:2009,
author
=
"J.Matkowski",
title
=
"Affine and convex functions with respect to the logarithmic mean",
journal
=
"Colloquium Mathematicum",
volume
=
"Vol. 95",
number
=
"no 2",
pages
=
"217--230",
year
=
"2003",
}