“PHYSICAL AND CHEMICAL CHARACTERISTICS OF BOVINE HIDE GELATIN WITH THE TYPE AND CONCENTRATION OF ACID AS A PRE -TREATMENT SOLUTION”, Settings Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit , vol. 22, no. 1, pp. 23–32, Dec. 2024, doi: 10.58533/2dk4e462.