TY CONF TI MODEL REPRESENTATION OF THE MICROSTRUCTURE OF SHUNGITE WITH REGARD TO ITS ELECTRICALLY CONDUCTIVE PROPERTIES KW composite environment KW graphene 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 2026 PB INFRA-M Academic Publishing LLC.