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Hang, N.T.T., Thanh, D.D. and Minh, L.H. 2017. Application of directional derivative method to determine boundary of magnetic sources by total magnetic anomalies. Vietnam Journal of Earth Sciences. 39, 4 (Dec. 2017), 360–375. DOI:https://doi.org/10.15625/0866-7187/39/4/10731.