00653naa#a2200181#i#450# EN\\bibl\109202 20260312185114.4 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 Irkutsk Institute of Solar-Terrestrial Physics SB RAS 2025 7 с. Journal article local Ионосфера и термосфера. 551.510.535 Polyakov Andrey Redzhenaldovich Tsegmed Battuulai ras.editorum.ru