Achilles Colombo Prudencio Roberto Willrich Michel Diaz Saïd Tazi Quality of Service Specifications: A Semantic Approach. 219-226 2009 NCA http://doi.ieeecomputersociety.org/10.1109/NCA.2009.36 conf/nca/2009 db/conf/nca/nca2009.html#PrudencioWDT09