Orman, Kamil, Abdullah Basci, and Adnan Derdiyok. “Speed and Direction Angle Control of Four Wheel Drive Skid-Steered Mobile Robot by Using Fractional Order PI Controller”. Elektronika ir Elektrotechnika 22, no. 5 (October 3, 2016): 14 - 19. Accessed May 3, 2024. https://eejournal.ktu.lt/index.php/elt/article/view/16337.