1. American Standard Acoustical Terminology, American Standards Association, Inc., New York 1951.
2. Fletcher, H.: Bell. Labor. Rec. 13, 130 (1935).
3. Dumond, J. W. M., E. R. Cohen, W. K. H. Panofsky and E. Deeds: J. Acoust. Soc. Amer. 18, 97 (1946).
4. Condon, E. U.: Amer. J. Phys. 1, 18 (1933).
5. Geiger, Rudolf: Mikroklima und Pflanzenklima. In Handbuch der Klimatologie, Vol. 1, Part D. Berlin: Gebrüder Borntraeger 1930. — See also the chapter on Dynamic Meteorology in this Volume.