Proceedings of the 7. International Congress on Acoustics. Budapest, 18-26. Aug. 1971. Sections M-P-U: Physical acoustics - International Congress on Acoustics 2. (Budapest, 1971)
SUPPORTED by the INTERNATIONAL COMMISSION ON ACOUSTICS of the INTERNATIONAL UNION OF PURE AND APPLIED PHYSICS the DEPARTEMENT let OF NATURAL SCIENCES of the HUNGARIAN ACADEMY OF SCIENCES the STATE OFFICE FOR TECHNICAL DEVELOPMENT Printed In Hungary