1. Global Burden of Cardiovascular Diseases and Risk Factors, 1990-2019: Update From the GBD 2019 Study;Roth;J Am Coll Cardiol,2020
2. Cardiovascular mortality and morbidity in seven counties in Sweden in relation to water hardness and geological settings. The project: myocardial infarction in mid-Sweden;Nerbrand;Eur Heart J,1992
3. Magnesium metabolism;Wacker;N Engl J Med,1968
4. Hasan M. Hard water From Wikipedia. [cited 2022 Jan 9]; Available from: https://www.academia.edu/5294108/Hard_water_From_Wikipedia.
5. On geographical relationship between the chemical nature of river water and death-rate from apoplexy (Preliminary Report);Kobayashi;Berichte des Ohara Instituts für landwirtschaftliche Biologie, Okayama Universität [Internet],1957