D. Khoirunnisa, H. ., and T. I. Rukmana, “ISOLATION AND CHARACTERISTICS OF BOVINE SKIN GELATIN AND ANALYSIS OF GLYCINE, PROLINE, AND HYDROXYPROLINE BY HIGH-PERFORMANCE LIQUID CHROMATOGRAPHYFLUORESCENCE”, Int J App Pharm, vol. 10, no. 1, pp. 269–275, Dec. 2018.