00644naa#a2200181#i#450# EN\\bibl\24467 20260313070803.5 2500-0535 20181221b2018####ek#y0engy0150####ca ENG RU Detecting groups of equidistant frequencies in spectra of geomagnetic pulsations Journal article Irkutsk Institute of Solar-Terrestrial Physics SB RAS 2018 8 с. Journal article local Геология. Геологические и геофизические науки. 55 ENG Polyakov Andrey Redzhenaldovich ras.editorum.ru