@article{Kowal:2009,
author
=
"M.Kowal and J.Mielniczuk",
title
=
"Yield criterion of the softwood under conditions of variable humidity",
journal
=
"Engineering Transactions",
volume
=
"Vol. 49",
number
=
"no 4",
pages
=
"529--535",
year
=
"2001",
}