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\bibitem{Coppo_etal2003} Mario Coppo, Mariangiola Dezani-Ciancaglini, Elio Giovannetti, and Ivano Salvo. "Mobility Types for Mobile Processes in Mobile Ambients." \textit{Electr. Notes Theor. Comput. Sci.} 78 (2003). DOI: 10.1016/S1571-0661(04)81011-9.

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