@article{Więckowski:2009,
author
=
"A.Więckowski",
title
=
"EPR investigations of the structure of bituminous coal",
journal
=
"Experimentelle Technik der Physik",
volume
=
"Jahrg. 36",
number
=
"H. 4-5",
pages
=
"299--303",
year
=
"1988",
}