PURBA, N. B., A. ROHMAN, and S. MARTONO. “THE OPTIMIZATION OF HPLC FOR QUANTITATIVE ANALYSIS OF ACID ORANGE 7 AND SUDAN II IN COSMETIC PRODUCTS USING BOX BEHNKEN DESIGN”. International Journal of Applied Pharmaceutics, Vol. 11, no. 2, Jan. 2019, pp. 130-7, doi:10.22159/ijap.2019v11i2.31285.