THOMAS, ASHA, S.A. KANDGAONKAR, LATA KOTHAPALLI, SUMITRA JANGAM, S. BODKHE, and MANISHA PATANKAR. 2010. “Simultaneous Estimation of Cefoperazone and Sulbactam in Bulk and Multicomponent Formulation”. Asian Journal of Chemistry 19 (5):3716-20. https://asianpubs.org/index.php/ajchem/article/view/13271.