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Al-Khaldi, M. H., Nasr-El-Din, H. A., Mehta, S., & Al-Aamri, A. D. (2007). Reaction of citric acid with calcite. Chemical Engineering Science, 62(21), 5880–5896. doi:10.1016/j.ces.2007.06.021 
10.1016/j.ces.2007.06.021