N. Hamid and M. S. Abd Munaim, “OPTIMIZATION ON DYEING UPTAKE EXHAUSTION PERCENTAGE OF BETACYANIN PIGMENT EXTRACTED FROM HYLOCEREUS POLYRHIZUS PEEL ONTO THE SPUN SILK YARN USING CENTRAL COMPOSITE DESIGN”, J. Chem. Eng. Ind. Biotechnol., vol. 1, no. 1, pp. 72–82, Mar. 2017, doi: 10.15282/jceib.v1i1.3813.