1. Rayleigh, Lord, Theory of Sound, second ed., 2, 62 (Macmillan, London, 1896).
2. Rayleigh, Lord, Theory of Sound, second ed., 2, 66 (Macmillan, London, 1896).
3. Nederveen, C. J., Acoustical Aspects of Woodwind Instruments, 60 (Knuf, Amsterdam, 1969).