Balazsi, Csaba, and Judit Pfeifer. 2001. “Structural and Morphological Observations on Tungsten Oxide Hydrates Ged to Room Temperature in Alkali Containing Queous Environment”. Communications - Scientific Letters of the University of Zilina 3 (4), 19-25. http://journals.uniza.sk/index.php/communications/article/view/1452.