Z. Alzoman, Nourah, et al. “A Validated Reverse Phase LC Method for the Simultaneous Estimation of Fexofenadine HCl and Pseudoephedrine HCl in Pharmaceutical Dosage Form Using a Monolithic Silica Column”. Asian Journal of Chemistry, vol. 24, no. 11, June 2012, pp. 5073-8, https://asianpubs.org/index.php/ajchem/article/view/9746.