Dondeti Mogili Reddy; Putchakayala Purnachandra Rao; D. Ramachandran. Stability Indicating HPLC Method for Simultaneous Estimation of Hydrochlorothioazide, Amlodipine and Valsartan in Pharmaceutical Dosage Form. World J Pharm Sci 2014, 2, 1830-1836.