M. del Carmen Suárez-Figueroa, A. Gómez-Pérez, и B. Villazón-Terrazas. Proceedings of OTM Conferences (2). On the Move to Meaningful Internet
Systems: OTM 2009, Confederated International Conferences, CoopIS,
DOA, IS, and ODBASE 2009., том 5871 из Lecture Notes in Computer Science, стр. 966-982. Vilamoura, Portugal, Springer, (2009)