MUHTADI, W. K., L. NOVITASARI, R. MARTIEN, and R. DANARTI. “FACTORIAL DESIGN AS THE METHOD IN THE OPTIMIZATION OF TIMOLOL MALEATE-LOADED NANOPARTICLE PREPARED BY IONIC GELATION TECHNIQUE”. International Journal of Applied Pharmaceutics, vol. 11, no. 5, Sept. 2019, pp. 66-70, doi:10.22159/ijap.2019v11i5.34435.