J. DHARUMAN, M. VASUDEVAN, K. SOMASEKARAN, B. DHANDAPANI, and P. D. GHODE, “RP-HPLC Method for Simultaneous Estimation of Ceftriaxone and Sulbatam in Parenteral Preparation”, ajc, vol. 21, no. 9, pp. 6852–6856, Mar. 2010.