TY CONF TI USE THE POWER OF SPECTROSCOPY FOR GEOMETRIC MODELING OF THE STRUCTURE OF SHUNGITE KW electric spectroscopy KW electrical conductivity KW shungite JO XXIV international conference "Electromagnetic field and materials (fundamental physical research)" AU Antonets, I.V. AU Golubev, E.A. AU Shavrov, V.G. AU Scheglov, V.I. PY 2025 PB INFRA-M Academic Publishing LLC.