00678naa#a2200193#i#450# EN\\bibl\109205 20260312211149.4 2500-0535 20251210b2025####ek#y0engy0150####ca ENG 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 6 с. Journal article local Ионосфера и термосфера. 551.510.535 ENG Polyakov Andrey Redzhenaldovich Tsegmed Battuulai ras.editorum.ru