Xiaocong Fan John Yen Rui Wang Shuang Sun Richard A. Volz Context-Centric Proactive Information Delivery. 31-37 2004 conf/iat/2004 IAT http://csdl.computer.org/comp/proceedings/iat/2004/2101/00/21010031abs.htm db/conf/iat/iat2004.html#FanYWSV04