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https://researchdiscovery.drexel.edu/esploro/outputs/journalArticle/Fluid-pressure-measurement-using-bubbles-insonified/991019174909604721 Fluid pressure measurement using bubbles insonified by two frequencies - Drexel University Fluid pressure measurement using bubbles insonified by two frequencies - Drexel University - Journal article fluid pressuremeasurementusingbubbles