L. Svilainis, K. Lukoseviciute, V. Dumbrava, A. Chaziachmetovas, and A. Aleksandrovas, “Application of Arbitrary Position and Width Pulse Trains Signals in Ultrasonic Imaging: Correlation Performance Study”, ELEKTRON ELEKTROTECH, vol. 19, no. 3, pp. 57-60, Feb. 2013.