M. KARIMI, M. NATEGHI, M. MALEKZADEH, F. BANIFATEMEH, and O. MORADLOU, “Simultaneous Spectrophotometric Determination of Paracetamol and p-Aminophenol by H-point Standard Addition Method and Partial Least Squares Regression”, ajc, vol. 19, no. 6, pp. 4533–4546, Mar. 2010.