Shkavro, Zinaida. “The Physico-Chemical Methods of Water Treatment for Utility and Drinking Purpose and Their Improvement”. Physics of Consciousness and Life, Cosmology and Astrophysics 13, no. 3 (September 25, 2013): 22–30. Accessed October 26, 2021. https://physics.socionic.info/index.php/physics/article/view/84.