Nga, Le Thi, and Vu Ngoc Thang. “Effect of Eggshell Powder on Growth and Physiology of Robusta Coffee Plant under Drought Stress”. Vietnam Journal of Agricultural Sciences 22, no. 8 (February 20, 2025). Accessed November 3, 2025. https://vie.vjas.vn/index.php/vjasvn/article/view/1734.