Lehocky, P., R. Kohar, S. Hrcek, J. Podhorsky, B. Surmova, S. Medvecky, and A. Hrcekova. “Automative Unwinding of Waste Paper from Reel Spools”. Communications - Scientific Letters of the University of Zilina, Vol. 9, no. 1, Mar. 2007, pp. 60-66, http://journals.uniza.sk/index.php/communications/article/view/1116.