Ramogayana, B., K. Maenetja, and P. Ngoepe. “The Effect of Niobium Doping on Lithium Manganese Oxide Surfaces, LiMn2-XNbxO4: DFT Study”. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt;, Vol. 40, no. 1, Jan. 2022, pp. 22-26, http://satnt.co.za/index.php/satnt/article/view/872.