1999 · Uwe Krüger, Jens Hüren, et al. · Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations · 47
2001 · Jörg Schlüter, Thilo Schönfeld, et al. · Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations · 22