KONAR, R.; MICIAN, M.; MESKO, J.; SVENTEK, M. Identification of Lack of Fusion and Penetration in Circumferential Fillet Weld by Phased Array Ultrasonic Method in Gas Industry. Communications - Scientific letters of the University of Zilina, v. 17, n. 3, p. 98-102, 31 Aug. 2015.