S. T. Kassem and K. A. El-Shemy, “Extracting chromium-free protein hydrolysate from leather tanning wastes”, IJEAB, vol. 8, no. 6, Dec. 2023, Accessed: Nov. 21, 2024. [Online]. Available: https://i.agriculturejournals.org/index.php/ijeab/article/view/89