Pham, L. T., E. Oksum, T. D. Do, and M. L. Huy. “New Method for Edges Detection of Magnetic Sources Using Logistic Function”. Geofizicheskiy Zhurnal 40, no. 6 (December 21, 2018): 127–135. Accessed August 19, 2022. http://journals.uran.ua/geofizicheskiy/article/view/151033.