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\bibdata{References}
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\bibcite{van1994physics}{2}
\bibcite{danikas1998some}{3}
\bibcite{paithankar1997can}{4}
\bibcite{kolev1998partial}{5}
\bibcite{ren2006simulation}{6}
\bibcite{kolev1999approach}{7}
\bibcite{satish1994artificial}{8}
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\bibcite{gutfleisch1995measurement}{9}
\bibcite{bartnikas2002partial}{10}
\bibcite{karmakar2009partial}{11}
\bibcite{karmakar2009monitoring}{12}
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\bibcite{kim2003acoustic}{17}
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\bibcite{guastavino2011morphologic}{33}
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