Pasha, Chand, and Badiadka Narayana. “A Simple Method for the Spectrophotometric Determination of Cephalosporins in Pharmaceuticals Using Variamine Blue”. Eclética Química 33, no. 2 (June 23, 2008): 41–46. Accessed April 8, 2025. https://revista.iq.unesp.br/index.php/ecletica/article/view/302.