Jan Sovcik, Martin Kajan, Martin Smolak, Martin Florek, Peter Hubinsky, and Marek Ližiciar . 2015. “Ultrasonic Localization of Multiple Robots”. International Journal of Robotics and Automation Technology 2 (2):65-72. https://doi.org/10.15377/2409-9694.2015.02.02.2.