Kajanek, D., Hadzima, B. and Pastorek, F. 2019. Errata: Communications – Scientific Letters of the University of Zilina, Vol. 20, No. 3, 2018, „Electrochemical Characterization of Az31 Magnesium Alloy Treated by Ultrasonic Impact Peening (Uip)“, pp. 24-29. The proper Acknowledgement should be as follow. Communications - Scientific letters of the University of Zilina. 21, 1 (Feb. 2019), 75-79.