TY JOUR TI Combinatoric-Variational Approach to Solving Inverse Problems in Geophysics Within the Framework of the Discrete Potential Theory. Complex Geological Environment KW discrete potential KW combinatoric approach KW geological structure KW integral representation JO Russian Journal of Earth Sciences AU Stepanova, I.E. AU Kolotov, I.I. PY 2025 IS 25 PB Geophysical Center of the Russian Academy of Sciences