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\bibitem{Cesta_etal2010} Amedeo Cesta, Alberto Finzi, Simone Fratini, Andrea Orlandini, and Enrico Tronci. "Validation and verification issues in a timeline-based planning system." \textit{The Knowledge Engineering Review} 25, no. 03 (2010): 299--318. Cambridge University Press. DOI: 10.1017/S0269888910000160.

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