Zen, Freddy P, and Jusak S Kosasih. “D-Branes and M-Theory in Supersting Theories”. Indonesian Journal of Physics 14, no. 4 (October 1, 2003): 121-128. Accessed November 24, 2024. https://ijphysics.fi.itb.ac.id/index.php/ijp/article/view/90.