Zehra, B., Nawaz, H. R., Solangi, B. A., Nadeem, U., Ayaz, T., & Zeeshan, M. (2018). An Efficient Recovery of Chromium From Tanning Liquor waste and its Reutilization for the Production of Quality Leather. American Scientific Research Journal for Engineering, Technology, and Sciences, 41(1), 263-270. https://asrjetsjournal.org/American_Scientific_Journal/article/view/3946