@article{Więckowski:2009,
author
=
"A.Więckowski and W.Wojtowicz and B.Pilawa",
title
=
"EPR characteristics of petrographically complex coal samples from durain and clarain",
journal
=
"Fuel",
volume
=
"Vol. 79",
number
=
"no 9",
pages
=
"1137--1141",
year
=
"2000",
}