Orman, K., Basci, A. and Derdiyok, A. 2016. Speed and Direction Angle Control of Four Wheel Drive Skid-Steered Mobile Robot by Using Fractional Order PI Controller. Elektronika ir Elektrotechnika. 22, 5 (Oct. 2016), 14 - 19. DOI:https://doi.org/10.5755/j01.eie.22.5.16337.