R. Ahmed, Nief, and Suhaib N. Lottfi. “High Performance Liquid Chromatographic Method for Determination of Sildenafil Citrate (Viagra) in Pharmaceutical Formulation and Industrial Effluent Sample”. Rafidain Journal of Science 24, no. 9 (September 1, 2013): 24–31. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/rsci/article/view/47461.