H. M. EL-Fatatry, Mokhtar M. Mabrouk, Sherin F. Hammad, and Salwa H. Elsheikh, “Different ratio spectra methods for simultaneous determination of Olmesartan Medoxomil, Hydrochlorothiazide and Amlodipine Besylate”, J Inn Pharm Bio Sci, vol. 3, no. 2, pp. 166–181, Apr. 2016.