00670naa#a2200205#i#4500001002100000005001700021011001400038100004100052101000800093102000700101200016500108210005100273215001100324608002700335700001800362700001700380700003100397700002100428856001500449EN\INFRA-M\bibl\590120240921163054.6##a1998-071X##a20150425b2015####ek#y0engy0150####ca0#aRUS##aRU1#aChange in the Natural Vibration Frequency Spectrum of the Steel Pipe Mathematic Model Depending on Sizes, Location, and Number of Local DefectseJournal article1#aMoscowcINFRA-M Academic Publishing LLC.d2015##a12 с.##aJournal article2local#1aSuslonovgA. #1aSamaringV. #1aSushchevgSergey Petrovich#1aNovgorodovagA. 4#anaukaru.ru