Paulo Carvalho 0002 Solange Rito Lima André Ferreira Emanuel Freitas Filipe A. Leitao Providing Cost-effective QoS Monitoring in Multiservice Networks. 1-8 2009 NGI https://doi.org/10.1109/NGI.2009.5175778 conf/ngi/2009 db/conf/ngi/ngi2009.html#CarvalhoLFFL09