Suprapto, B. Y., and B. Kusumoputro. “Optimized Neural Network-Direct Inverse Control for Attitude Control of Heavy-Lift Hexacopter”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 9, no. 2-5, June 2017, pp. 103-7, https://jtec.utem.edu.my/jtec/article/view/2407.