20. Moen, C. J., "Ultrasonic Absorption in Liquids, " 

 Acoustical Society of America. Journal, v. 23, p. 62-70, 

 January 1951 



21. Knudsen, V. O. , "The Effect of Humidity Upon the 

 Absorption of Sound in a Room, and a Determination of the 

 Coefficients of Absorption of Sound in Air, " Acoustical 

 Society of America. Journal, v. 3, p. 126-138, July 1931 



22. Mulders, C. E. , "Ultrasonic Reverberation Measure- 

 ments in Liquids II, " Applied Scientific Research, v. Bl, 



p. 341-357, 1950 



2 3. Ferrero, M. A. and Sacerdote, G. G., "Measurement 

 of Acoustic Impedance in a Resonant Spherical Enclosure, " 

 Acustica , v. 8, p. 325-329, 1958 



24. Karpovich, J., "Resonance Reverberation Method for 

 Sound Absorption Measurements, " Acoustical Society of 

 America. Journal , v. 26, p. 819-823, September 1954 



25. Wilson, O. B. , Jr., and Leonard, R. W. , "Measure- 

 ments of Sound Absorption in Aqueous Salt Solutions by a 

 Resonator Method, " Acoustical Society of America. Journal, 

 v.26, p. 223-226, March 1954 



26. Toulis, W. J., "Theory of a Resonance Method to 

 Measure the Acoustic Properties of Sediments, " Geophysics, 

 v.21, p. 299-304, April 1956 



2 7. Hunt, F. V. and others, "Analysis of Sound Decay in 

 Rectangular Rooms, " Acoustical Society of America . 

 Journal, v. 11, p. 80-94, July 1939 



28. Hunt, F. V., "Notes on the Exact Equations Governing 

 the, Propagation of Sound in Fluids, " Acoustical Society of 

 America. Journal , v. 27, p. 1019-1039, November 1955 



2 9. Morse, P. M. , "Some Aspects of the Theory of Room 

 Acoustics, " Acoustical Society of America. Journal, v. 11, 

 p. 56-66, July 1939 



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