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\bibitem{RaulA.Mira_etal2019} Raul A. Mira, Patricia L. Suarez, Rafael E. Rivadeneira, \& Angel D. Sappa. (2019). PETRA: A Crowdsourcing-Based Platform for Rocks Data Collection and Characterization. In \textit{IEEE ETCM 2019 Fourth Ecuador Technical Chapters Meeting; Guayaquil, Ecuador} (pp. 1--6).

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