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2. Das Schallfeld der kreisförmigen Kolbenmembran;BACKHAUS;Ann. Phys.,1930
3. The Mathematical Theory of Huyghens’ Principle;BAKER,1950
4. Tables Numériques Universelles;BOLL,1957
5. Interference Patterns in the Near Field of a Circular Piston;DEHN;J. Acoust. Soc. America,1960