TY JOUR TI Determination of 3D Gravity Source and Its Depth Beneath Cameroon Volcanic Line (CVL) Using DEXP Transformation KW Cameroon Volcanic Line KW DEXP Transformation KW 3D gravity model KW Spectral Analysis KW Structural index JO Russian Journal of Earth Sciences AU Ekolle, N.. AU Василевский, А.Н. AU Есин, Е.И. PY 2025 IS 25 PB Геофизический центр Российской Академии Наук