@article{Więckowski:2009,
author
=
"A.Więckowski and B.Pilawa and M.Lewandowski",
title
=
"EPR analysis of coal macerals",
journal
=
"ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY",
number
=
"no 1",
pages
=
"909--912",
year
=
"1998",
}