Li, Shuai. “Effects of Aging on The Bioavailability of Cu and Cd Immobilized by Biochars With Varying Endogenous Heavy Metal Concentrations”. World Scientific Research Journal 11, no. 9 (September 10, 2025): 50–60. Accessed August 3, 2026. https://wsr-j.org/index.php/ojs/article/view/38.