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Parthasarathy, S., Pancholy, M., & Chhapgar, A. F. (1953).
The Piezo-Electric Oscillations of a Quartz Crystal at its Odd, Even and Half-Odd Harmonics. Annalen Der Physik, 447(1-3), 1–7.
doi:10.1002/andp.19534470102
10.1002/andp.19534470102