I. ULLAH KHAN, S. MUBARAK, M. ASHFAQ, and N. YAQOOB, “Analytical Properties of Pyridine-2,4,6-tricarboxylic Acid: Determination of Iron in Food Samples and Quantification of Tetracyclines”, ajc, vol. 19, no. 7, pp. 5341–5350, Mar. 2010.