00641naa#a2200181#i#450# EN\INFRA-M\bibl\109202 20260201080000.7 2712-9640 20251210b2025####ek#y0engy0150####ca RU Detecting groups of eigenfrequencies of vertical standing waves in the layered structure of the Earth’s crust Journal article Moscow INFRA-M Academic Publishing LLC. 2025 7 с. Journal article local Ионосфера и термосфера. 551.510.535 Polyakov Andrey Redzhenaldovich Tsegmed Battuulai naukaru.ru