Jan Sovcik, Martin Kajan, Martin Smolak, Martin Florek, Peter Hubinsky, & 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