@article{Pilawa:2009,
author
=
"B.Pilawa and A.Więckowski and B.Trzebicka",
title
=
"Pyridine extraction of macerals and changes in their populations of paramagnetic centers",
journal
=
"Molecular Physics Reports",
volume
=
"Vol. 5",
pages
=
"245--250",
year
=
"1994",
}