Kucera, L., T. Gajdosik, and J. Bucala. “The Vibrodiagnostics of Damaged Gears of Planetary Gearboxes”. Communications - Scientific Letters of the University of Zilina, Vol. 16, no. 3A, Oct. 2014, pp. 67-73, http://journals.uniza.sk/index.php/communications/article/view/546.