GUNASEKARAN, S., T.S. RENUGA DEVI, and P.S. SAKTHIVEL. 2010. “FTIR, FT Raman and UV-Visible Spectral Measurements and Analysis on Atorvastatin Calcium”. Asian Journal of Chemistry 19 (1):335-46. https://asianpubs.org/index.php/ajchem/article/view/20426.