References
- Kinsler, L. E. & Frey, A. R., Fundamentals of Acoustics (John Wiley & Sons), 1958, p. 107.
- Crandall, I. B., Vibrating Systems and Sound(Van Nostrand Co.), 1954, p. 20.
- Beranek, L. L., Acoustics (McGraw-Hill), 1954, p. 160.
- Crandall, I. B., Vibrating Systems and Sound (Van Nostrand Co.), 1954, p. 35.
- Hilliard, J. K. & Noble, J. J., I.R.E. Trans actions—Audio, AU2 (Nov.-Dec. 1954), No. 6, p. 170.