@article{Pilawa:2009,
author
=
"B.Pilawa and A.Więckowski and S.Duber",
title
=
"EPR study of the bituminous coal : ethylenediamine system",
journal
=
"Erdöl und Kohle Erdgas Petrochemie - Hydrocarbon Technology",
volume
=
"Jahrg. 43",
number
=
"H. 6",
pages
=
"240--245",
year
=
"1990",
}