TY JOUR TI Effect of shungite plate thickness on its electrophysical properties: technological and geophysical aspects KW shungite KW electrophysical properties KW impedance KW microstructure JO Vestnik of geosciences AU Golubev, Y.A. AU Antonets, I.V. PY 2024 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"