@inbook{1175620345,
author={Robert A. Weiss and Margaret A. Weiss and Karen L. Beasley},
title={Continuous Wave Doppler},
booktitle={Sclerotherapy and Vein Treatment, 2e},
publisher={McGraw Hill LLC},
address={New York, NY},
year={2012},
url={dermatology.mhmedical.com/content.aspx?aid=1175620345}
}