PATEL VISHVAS D and PATEL PARESH U 2014. DEVELOPMENT AND VALIDATION OF RATIO SPECTRA DERIVATIVE METHOD FOR THE SIMULTANEOUS ESTIMATION OF BETAHISTINE DIHYDROCHLORIDE AND PROCHLORPERAZINE MALEATE IN TABLET DOSAGE FORM. International Journal of Pharmaceutics and Drug Analysis. 2, 3 (Mar. 2014), 155-160.