00666naa#a2200193#i#450# EN\INFRA-M\bibl\109205 20260120153439.2 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 Moscow INFRA-M Academic Publishing LLC. 2025 6 с. Journal article local Ионосфера и термосфера. 551.510.535 ENG Polyakov Andrey Redzhenaldovich Tsegmed Battuulai naukaru.ru