Pal, Sumita, Harikesh Bahadur Singh, and Amitava Rakshit. “Potential of Different Crop Species for Nickel and Cadmium Phytoremediation in Peri-Urban Areas of Varanasi District (India) With More Than Twenty Years of Wastewater Irrigation History”. Italian Journal of Agronomy 8, no. 1 (March 7, 2013): e8. Accessed September 25, 2020. https://www.agronomy.it/index.php/agro/article/view/ija.2013.e8.