Guisheng Fan Huiqun Yu Dongmei Liu Liqiong Chen Modeling and Analyzing Time Constrains for Service Composition. 124-129 2008 ICYCS http://dx.doi.org/10.1109/ICYCS.2008.404 conf/icycs/2008 db/conf/icycs/icycs2008.html#FanYLC08