Is there a good book reference on the definition of "subharmonic frequency" as integer fractions of the highest available frequency?
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$\begingroup$ There are a few here: en.wikipedia.org/wiki/Subharmonic#References $\endgroup$ – MBaz Oct 3 '15 at 23:31
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$\begingroup$ Well, they are music and acoustic books, but I need a mathematical, or electrical engineering, or DSP area book reference. $\endgroup$ – qazwsx Oct 4 '15 at 4:15
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"Highest available frequency" sounds fishy but here's a reference from dynamics:
Cunningham, Walter Jack. Introduction to Nonlinear Analysis. 1st ed. New York, USA: McGraw-Hill, 1958, pp. 191–192.
ISBN 10: 0070149178 ISBN 13: 9780070149175
