By Exner M. L.   Hampe W.   in Acta Acustica united with Acustica

ISSN:1610-1928|3|2|67-72

S. Hirzel Verlag‎(1953)‎

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By Exner M.-L.   Güth W.   Immer F.   in Acta Acustica united with Acustica

ISSN:1610-1928|4|2|350-358

S. Hirzel Verlag‎(1954)‎

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