Arif, M., 		Asim, M., & 		Memon, F.
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 Use of Nonlinear Frequency Modulated Signals for the Enhancement of Subharmonic Response from Contrast Microbubbles.
<em>Mehran University Research Journal Of Engineering And Technology, 36</em>(1), 183-192.
doi:10.22581/muet1982.1701.18