N. R. Supadmana Muda, I. Wardana, N. Hamidi, L. Yuliati, and G. Witjaksono, “Electron spins coupling of coconut shell activated nanocarbons in solid propellant on improving to the thrust stability and specific impulses”, J. Mech. Eng. Sci., vol. 12, no. 4, pp. 4001–4017, Dec. 2018.