1. Review of contemporary works and many references may be found in articles by H. Grad and F. S. Sherman and L. Talbot, inProceedings of the First International Symposium on Rarefied Gas Dynamics, edited by F. M. Devienne (Pergamon Press, Inc., London, 1960).
2. Schallausbreitung in Gasen bei hohen Frequenzen und sehr niedrigen Drucken
3. D. Kahn, Ph.D. thesis, Yale University (1962).
4. P. M. Morse and H. Feshbach,Methods of Theoretical Physics(McGraw-Hill Book Company, Inc., New York, 1953), Chap. 4.
5. Propagation and Reflection of Sound in Rarefied Gases. II. Experimental