1. Cardiovascular diseases (CVDs), https://www.who.int/en/news-room/factsheets/detail/cardiovascular-diseases-(cvds). Last accessed 12 sep 2021
2. R.O. Bonow et al.: ACC/AHA 2006 guidelines for the management of patients with valvular heart disease: a report of the American College of Cardiology/American
Heart Association Task Force on Practice Guidelines: developed in collaboration with the Society of Cardiovascular Anesthesiologists: endorsed by the Society for
Cardiovascular Angiography and Interventions and the Society of Thoracic Surgeons. J Am Coll Cardiol. 48(3), pp. 1–148, (2006)
3. How the Heart Works, https://www.nhlbi.nih.gov/health-topics/how-heart-works. Last accessed 12 sep 2021
4. Heart Beat, https://my.clevelandclinic.org/health/articles/17064-heart-beat 5. E. Delgado-Trejos, A.F. Quinceno-Manrique, J.I. Godino-Llorente, M. Blanco-
Velasco, G. Castellanos-Dominguez.: Digital Auscultation Analysis for Heart Murmur Detection. Annals of Biomedical Engineering, 37(2), pp. 337–353, (February 2009)
5. Shindler, Daniel M. MD, FACC.: Practical Cardiac Auscultation. Critical Care Nursing Quarterly. 30(2), pp. 166-180 (April 2007)