@article{Duber:2009,
author
=
"S.Duber and A.Więckowski",
title
=
"Effects of organic solvents on the EPR spectrum of coal",
journal
=
"Fuel",
volume
=
"Vol. 63",
number
=
"no 12",
pages
=
"1641--1644",
year
=
"1984",
}