Blazek, D., J. Kudelcik, and J. Blazek. “A Design of an Induction Method Device With Respect to the Signal and Noise Sensitivity”. Communications - Scientific Letters of the University of Zilina, Vol. 5, no. 2, June 2003, pp. 44-47, http://journals.uniza.sk/index.php/communications/article/view/1352.