VITTEK, J.; ALTUS, J.; BEDNARIK, B.; TABACEK, R.; DODDS, S. J.; PERRYMAN, R. Research of New Sensorless Speed Controlled Drives with Induction Motors for Traction Applications. Communications - Scientific letters of the University of Zilina, v. 3, n. 2-3, p. 5-15, 30 Sep. 2001.