@article{Więckowski:2009,
author
=
"A.Więckowski and S.Duber",
title
=
"Determination of the molecular phases in bituminous coal by the EPR method",
journal
=
"Ferroelectrics",
volume
=
"Vol. 80",
number
=
"no 3",
pages
=
"95--98",
year
=
"1988",
}