Wolfram Burgard Armin B. Cremers Dieter Fox Martin Heidelbach Angelica Maria Kappel Stefan Lüttringhaus-Kappel Knowledge-Enhanced CO-monitoring in Coal-Mines. 511-520 1996 IEA/AIE conf/ieaaie/1996 db/conf/ieaaie/ieaaie1996.html#BurgardCFHKL96