00451naa#a2200157#i#450# EN\\bibl\30331 20240420020949.6 1609-3178 20190827b2019####ek#y0engy0150####ca RU Ultrasound History: Looking into Silence to Hear the Invisible Journal article Saint-Petersburg LLC SVEN 2019 3 с. Journal article local Grudskiy Mikhail Ya. naukaru.ru