Lenhard, R., M. Jakubsky, M. Malcho, and J. Jandacka. “Analysis of Transmission Phenomena in Low-Potential Heat Transport by Heat Pipes in the Deep- Borehole Simulator”. Communications - Scientific Letters of the University of Zilina, Vol. 14, no. 3, Sept. 2012, pp. 10-16, http://journals.uniza.sk/index.php/communications/article/view/754.