Davies, MJ; Newton, JD (2 July 2017). "Non-invasive imaging in cardiology for the generalist". British Journal of Hospital Medicine78 (7): 392–398. doi:10.12968/hmed.2017.78.7.392. பப்மெட்:28692375.
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einstein-online.info
Possel, Markus (2017). "Waves, motion and frequency: the Doppler effect". Einstein Online, Vol. 5. Max Planck Institute for Gravitational Physics, Potsdam, Germany. Archived from the original on September 14, 2017. பார்க்கப்பட்ட நாள் September 4, 2017.
Davies, MJ; Newton, JD (2 July 2017). "Non-invasive imaging in cardiology for the generalist". British Journal of Hospital Medicine78 (7): 392–398. doi:10.12968/hmed.2017.78.7.392. பப்மெட்:28692375.
Possel, Markus (2017). "Waves, motion and frequency: the Doppler effect". Einstein Online, Vol. 5. Max Planck Institute for Gravitational Physics, Potsdam, Germany. Archived from the original on September 14, 2017. பார்க்கப்பட்ட நாள் September 4, 2017.