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\bibitem{Badidi2005} Badidi, E., Serhani, M.A. \& Esmahi, L. (2005). A Queuing Model for Service Selection of Multi-classes QoS-aware Web Services. In \textit{the 3rd IEEE European Conference on Web Services} (pp. 204--212). V{\~A}{\^A}¤xj{\~A}{\^A}{\textparagraph}, Sweden.

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