@book{ 0-1627310037, title = {Sulphur and coal}, series = {IEA Coal Research publications}, author = {Vernon, Jan L. and Jones, Tim}, address = {London}, publisher = {IEA Coal Research}, year = {1993}, isbn = {9290292156}, language = {English}, url = {https://katalog.ub.tu-freiberg.de/Record/0-1627310037} }