00684naa#a2200193#i#450# EN\INFRA-M\bibl\24467 /en/manage/index 20250812225859.2 2500-0535 20181221b2018####ek#y0engy0150####ca ENG RU Detecting groups of equidistant frequencies in spectra of geomagnetic pulsations Journal article Moscow INFRA-M Academic Publishing LLC. 2018 8 с. Journal article local Геология. Геологические и геофизические науки. 55 ENG Polyakov Andrey Redzhenaldovich fht.editorum.ru /en/manage/index