RAMAVTARAM, D. V. S. S. . Drinking Water - Hard or Soft?. National Journal of Community Medicine, [S. l.], v. 3, n. 01, p. 1–2, 2012. Disponível em: https://njcmindia.com/index.php/file/article/view/1618. Acesso em: 3 may. 2024.