Mamuru, Solomon, Abubakar Bello, and Saminu Hamman. “Annona Squamosa Leaf Extract As an Efficient Bioreducing Agent in the Synthesis of Chromium and Nickel Nanoparticles”. International Journal of Applied Sciences and Biotechnology 3, no. 2 (June 25, 2015): 167-169. Accessed May 15, 2021. https://www.nepjol.info/index.php/IJASBT/article/view/11651.