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System and method for determining the level of a substance in a container based on measurement of resonance from an acoustic circuit that includes unfilled space within the container that changes size as substance is added or removed from the container
J. Acoust. Soc. Am. 138, 1801 (Tue Sep 01 00:00:00 UTC 2015); http://dx.doi.org/10.1121/1.4933717