↑ Agarwal, Anant. Foundations of Analog and Digital Electronic Circuits.Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 2005, p. 43
↑ Winer, Ethan (2013). "Part 3". The Audio Expert. New York and London: Focal Press. ISBN 978-0-240-82100-9.
↑ Fraden J. (2016). Handbook of Modern Sensors: Physics, Designs, and Applications 5th ed. Springer. p.7
