Chuangmu, Zheng, Wu Wei, and Rui Yukui. “Effects of Organic Fertilizer on the Contents and Distribution of Heavy Metals in Spinach”. Asian Journal of Chemistry 24, no. 6 (February 11, 2012): 2811–2812. Accessed June 30, 2024. https://asianpubs.org/index.php/ajchem/article/view/9232.