00683naa#a2200205#i#450# EN\INFRA-M\bibl\42233 20240512164324.7 2500-0535 20211220b2021####ek#y0engy0150####ca ENG RU On the group velocity of whistling atmospherics Journal article Moscow INFRA-M Academic Publishing LLC. 2021 3 с. Journal article local Геология. Геологические и геофизические науки. 55 ENG Guglielmi Anatol Vladimirovich Klain Boris Icikovich Potapov Alexander Sergeevich naukaru.ru