P. Abhishesh and  B. S. Ryuh and  Y. S. Oh and  H. J. Moon and  R. Akanksha ,  Multipurpose Agricultural Robot Platform: Conceptual Design of Control System Software for Autonomous Driving and Agricultural Operations Using Programmable Logic Controller.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 123(3). 507 - 511
    [viewed 20 September 2020]. Available from: https://publications.waset.org/pdf/10006517.