Kajanek, D., Hadzima, B., & 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), 75-79. Retrieved from http://journals.uniza.sk/index.php/communications/article/view/646