KAJANEK, D.; HADZIMA, B.; PASTOREK, F. 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, v. 21, n. 1, p. 75-79, 20 Feb. 2019.