Muchlisyam, Sudarmi, and C. Caroline. “MEAN CENTERING OF RATIO SPECTRA METHOD FOR THE ANALYSIS OF THEOPHYLLINE AND EPHEDRINE HCL MIXTURE IN TABLET”. Asian Journal of Pharmaceutical and Clinical Research, vol. 11, no. 5, May 2018, pp. 218-23, doi:10.22159/ajpcr.2018.v11i5.24365.