Tuan Nguyen Alan W. Colman Jun Han 0004 Modeling and Managing Variability in Process-Based Service Compositions. 404-420 2011 ICSOC https://doi.org/10.1007/978-3-642-25535-9_27 conf/icsoc/2011 db/conf/icsoc/icsoc2011.html#NguyenCH11