@article{Duber:2009,
author
=
"S.Duber and A.Więckowski",
title
=
"Excited triplet states in bituminous coal",
journal
=
"Fuel",
volume
=
"Vol. 63",
number
=
"no 10",
pages
=
"1474--1475",
year
=
"1984",
}