00451naa#a2200157#i#4500001001500000005001700015011001400032100004100046102000700087200008400094210003700178215001000215608002700225700002600252856001500278EN\\bibl\3033120240420150919.6##a1609-3178##a20190827b2019####ek#y0engy0150####ca##aRU1#aUltrasound History: Looking into Silence to Hear the InvisibleeJournal article1#aSaint-PetersburgcLLC SVENd2019##a3 с.##aJournal article2local#1aGrudskiygMikhail Ya.4#anaukaru.ru