PRAKASH, K., VENKATESWARA RAO, J., APPALA RAJU, N., & HIMABINDU, V. (2010). Spectrophotometric Estimation of Formoterol Fumerate in Pharmaceutical Formulations. Asian Journal of Chemistry, 19(7), 5129–5133. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/13114