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\bibitem{BAPhm+Tronci1987} Corrado B{\~A}{\textparagraph}hm, and Enrico Tronci. "X-separability and left-invertibility in the $\lambda$-calculus (extended abstract, invited paper)." In \textit{Proceedings of: Temi e prospettive della Logica e della Filosofia della Scienza contemporanea}. Cesena - Italy, 1987.

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