00740naa#a2200217#i#450# EN\INFRA-M\bibl\113884 20260412050543.7 2500-0535 20260325b2026####ek#y0engy0150####ca ENG RU Critical level influence on the spectra of secondary gravity waves in the middle and upper atmosphere Journal article Moscow INFRA-M Academic Publishing LLC. 2026 8 с. Journal article local Гравитационные волны. 551.511.31 ENG Gavrilov Nikolay Mihaylovich Kshevetskii Sergey Petrovich Koval Andrey Vladislavovich Kurdyaeva Yulia A. naukaru.ru