References

1. A. D. Pierce, Acoustics: An Introduction to its Physical Principles and Applications, 2nd edition, Acoustical Society of America (1989).
2. J. H. Ginsberg, Acoustics—A Textbook for Engineers and Physicists, Springer, Acoustical Society of America (2018).
3. S. T. Thornton and J. B. Marion, Classical Dynamics of Particles and Systems, 5th edition, Brooks/Cole (2008).
4. "Fermat's principle," Wikipedia.
5. D. Marcuse, Light Transmission Optics, Bell Laboratories Series, Van Nostrand Reinhold Company (1972).

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