Acoustic impedance

https://www.wikidata.org/wiki/Q975684

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Medicine 48.2M papers	Physics 31.7M papers	Engineering 23.9M papers	Quantum mechanics 13.1M papers
Electrical engineering 4.7M papers	Radiology 3.1M papers	Acoustics 2.8M papers	Electrical impedance 159k papers
Ultrasonic sensor 142k papers
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Acoustic impedance 8,470 papers
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