Werner Kießling Stefan Fischer 0003 Sven Döring COSIMAB2B - Sales Automation for E-Procurement. 59-68 2004 conf/wecwis/2004 CEC http://csdl.computer.org/comp/proceedings/cec/2004/2098/00/20980059abs.htm db/conf/wecwis/cec2004.html#KiesslingFD04