00612naa#a2200169#i#450# EN\STRATEGIYA BUDUSCHEGO\bibl\6a9c148f32807fdbab85fe40 20260917133622.4 20201201b2020####ek#y0engy0150####ca RU Polyharmonic signals and their properties Journal article Saint-Petersburg Strategy of the Future 2020 13 с. Journal article local Различные отрасли промышленности и ремесла. 68 Butyrskiy Evgeniy Yurievich Rahuba Vitaliy Pavlovich futurepubl.ru