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== External links ==
* [http://www.echotext.info/ Echocardiography Textbook by Bonita Anderson]
* [http://www.americanheart.org/presenter.jhtml?identifier=3005161 Echocardiography (Ultrasound of the heart)]
* [https://web.archive.org/web/20060814010939/http://www.echoincontext.com/doppler01/doppler01_01.asp Doppler Examination - Introduction]
* [https://web.archive.org/web/20080511193224/http://www.echoincontext.com/doppler01/doppler01_02.asp The Doppler Principle and the Study of Cardiac Flows]
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