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© May 2005 Lorentz JÄNTSCHI && Sorana Daniela BOLBOACĂ

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 H01 Natural Sciences D010811 +
  H01.671 Physics D010825 +
   H01.671.031 Acoustics D000162 +
     H01.671.031.503 Psychoacoustics D011571 
     H01.671.031.675 Sound D013016 +
     H01.671.031.849 Ultrasonics D014465 +