Hlavna, Vladimir, Dusan Sojcak, and Rastislav Istenik. “Nonconventional Principle of Conversion of Heat into Cold in an Internal Combustion Engine”. Communications - Scientific letters of the University of Zilina 8, no. 2 (June 30, 2006): 10-22. Accessed April 6, 2026. http://journals.uniza.sk/index.php/communications/article/view/1187.