00629naa#a2200181#i#450# EN\\bibl\38866 20241125232033.1 2072-9502 20200721b2020####ek#y0engy0150####ca RU RESEARCH OF RADIO FREQUENCY SPECTROGRAMS USING METHODS OF LINGUISTIC ANALYSIS Journal article Astrakhan Astrakhan State Technical University 2020 6 с. Journal article local Прикладные науки. Общие вопросы. 60 Tretiakov Igor Aleksandrovich Danilov Vladimir Vasilevich vestnik.astu.org