Simon Walker (2001) Experience from Coal Industry Restructuring, London, United Kingdom, IEA Coal Research - The Clean Coal Centre, July 2001 (http://www.iea-coal.org.uk).
Simon Walker (2001) «Experience from Coal Industry Restructuring», Londres, Royaume-Uni, Coal Research de l'AIE − The Clean Coal Centre, juillet 2001 (http://www.iea-coal.org.uk).