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\bibitem{Intrigila_etal2001} Benedetto Intrigila, Ivano Salvo, and Stefano Sorgi. "A characterization of weakly Church-Rosser abstract reduction systems that are not Church-Rosser." \textit{Information and Computation} 171, no. 2 (2001): 137--155. Academic Press, Inc.. ISSN: 0890-5401. DOI: 10.1006/inco.2001.2945.

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