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3. Non-invasive intrathoracic blood velocity measurement in the assessment of cardiovascular function;Cross, G.; Light, L.H.;Bio-Medical Engineering,1974
4. Cross, G., Light, L. H., and Sequeira, R. F. (1974). Transcuta2a4n0nd,eopu1u6sl.mcoonmaprayriasrotneroyfofblcohoidldfrelno.w jvoeulronciatlyoifnPhtyhseioaloortgiyc
5. Safety of diagnostic ultrasound;Curzen, P.;Practitioner,1972