Optical Properties of Tap Water Purity using He-Ne Laser with Different Power Density. Al-Nahrain Journal of Science, [S. l.], v. 17, n. 3, p. 99–107, 2018. Disponível em: https://anjs.edu.iq/index.php/anjs/article/view/410.. Acesso em: 3 may. 2024.