@article{Duber:2009,
author
=
"S.Duber and A.Więckowski",
title
=
"E.p.r. study of molecular phases in coal",
journal
=
"Fuel",
volume
=
"Vol. 61",
number
=
"no 5",
pages
=
"433--436",
year
=
"1982",
}