V. Natalia, A. P. Gustami, F. Rahmawati, W. W. Lestari, and A. Purwanto, “Lithium Titanate (LTO) Synthesis Through Solid State Reaction and Its Performance for LiFePO4/LTO Battery”, J. Math. Fund. Sci., vol. 50, no. 3, pp. 290-302, Dec. 2018.