A. F. F. P. F. L. Ikhwandi, Arif Ismul Hadi, Hilmi Zakariya, and R. Refrizon, “Identification of the Manna Segment Sumatran Fault Using GGMplus Gravity Anomaly Data with the Second Vertical Derivative (SVD) Method”, J. Ilmu Fis. , vol. 15, no. 2, pp. 123–136, May 2023.