Shang , Xiaoyan, et al. “Microwave-Enhanced Tea Saponin-Citric Acid Composite Leaching for Remediation of Heavy Metal-Contaminated Soil in Southern Yunnan Mining Areas”. Scientific Journal of Technology, vol. 7, no. 12, Dec. 2025, pp. 103-15, https://doi.org/10.54691/43wszg35.