J. R. Rao and J. R. Rao, “RP-HPLC METHOD FOR SIMULTANEOUS ESTIMATION OF ASPIRIN, RAMIPRIL, HYDROCHLOROTHIAZIDE, SIMVASTATIN AND ATENOLOL FROM PHARMACEUTICAL DOSAGE FORM”, Int J Pharm Pharm Sci, vol. 6, no. 9, pp. 443–448, Sep. 2014.