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Larson, R.A.; Weston, J.C.; Howell, S.M., Quantitative Gas Chromatographic Determination of Nitrilotriacetic Acid in the Presence of Other Carboxylic Acids, J. Chromatogr., 1975, 111, 1, 43-49, https://doi.org/10.1016/S0021-9673(01)80144-8 . [all data]