@InProceedings{Więckowski:2001,
author
=
"A.Więckowski and B.Pilawa",
title
=
"Groups of paramagnetic centers in coals and macerals",
booktitle
=
"11th International Conference on Coal Science Exploring the horizons of coal",
address
=
"San Francisco, Stany Zjednoczone",
publisher
=
"San Francisco [brak wydawcy] ",
pages
=
"[4] CD-ROM",
organization
=
"U.S Department of Energy National Energy Technology Laboratory",
year
=
"2001",
}