Cekerevac, Zoran, Zdenek Dvorak, Ludmila Prigoda, and Petar Cekerevac. “Risks of Bitcoin Virtual Currency”. Communications - Scientific letters of the University of Zilina 17, no. 1 (February 28, 2015): 93-98. Accessed April 6, 2026. http://journals.uniza.sk/index.php/communications/article/view/399.