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\bibitem{DellaPenna_etal2002} Giuseppe Della Penna, Benedetto Intrigila, Enrico Tronci, and Marisa Venturini Zilli. "Synchronized Regular Expressions." \textit{Electr. Notes Theor. Comput. Sci.} 62 (2002): 195--210. Notes: TOSCA 2001, Theory of Concurrency, Higher Order Languages and Types.

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