WonSeok Lee Cheol Min Lee Jung Won Lee Jin-soo Sohn ROA Based Web Service Provisioning Methodology for Telco and Its Implementation. 511-514 2009 APNOMS http://dx.doi.org/10.1007/978-3-642-04492-2_65 conf/apnoms/2009 db/conf/apnoms/apnoms2009.html#LeeLLS09