Isuru Galgamuwa, Lilantha Samaranayake, Parakrama Ekanayake, and Kaveen Liyanage
 http://robots.net/rcfaq.html (Visited June 8, 2016).
 R. Siegwart and I.R.Nourbakhsh, Introduction to autonomous mobile robots (Cambridge, MA: MIT Press, 2004).
 C.L. Breazeal, Designing sociable robots (Cambridge, MA: MIT Press, 2002).
 H.P. Oliveira, A.J. Sousa, A.P. Moreira, and P.J. Costa, Modelling and assessing of omni-directional robots with three and four wheels, Contemporary Robotics – Challenges and Solutions, InTech Open Science, December 1, 2009
 http://www.vexrobotics.com/omni-wheels.html (Visited May 8, 2016).
 O. Diegel, A. Badve, G. Bright, J. Potgieter, and S. Tlale, Improved mecanum wheel design for omni-directional robots, Proc. Australasian Conference on Robotics and Automation, Auckland, November, 2002, 117–121.
 http://www.cs.cmu.edu/∼reshko/PILOT/ (Visited May 8,2016).
 Y. Liu, J. Zhu, R.L. Williams II, and J. Wu, Omni-directional mobile robot controller based on trajectory linearization, Robotics and Autonomous Systems, 56, 2008, 461–479.
 F. Fahimi and S. Praneeth, A universal trajectory tracking controller for mobile robots via model-free online reinforcement learning, ACTA Press – Control and Intelligent Systems, 2015.
 F. Golnaraghi and B.C. Kuo, Automatic control systems, 9th ed. (Hoboken-USA: Wiley, 2009).
 K. ˚Astr¨om and B. Wittenmark, Computer controlled systems: theory and design, 3rd ed. (New York: Dover, 2011).
 H. Khalil, Nonlinear systems, 3rd ed. (New Jersey: Prentice Hall, 2001).
 J. Wu, Dynamic path planning of an omni-directional robot in a dynamic environment, Ph.D. Thesis, Ohio University, March, 2005.
 F. Haugen, Discrete-time signals and systems (equation 61 and 115) (Norway: TechTeach, 2005).
 http://waijung.aimagin.com/ (Visited June 15, 2016).
 ´A.D.O. Guimar˜aes, J.P.D. Silva, and E.R.M. Dantas, Genetic algorithm applied to control of DC motor with disturbance rejection by feed forward action, ACTA Press – Control and Intelligent Systems, volume 43, 2599, 2015.
 S.K. Choudhary, Robust PID controller design for ball and beam system using classical loop-shaping technique, ACTA Press – Control and Intelligent Systems, volume 44, 2717, 2016.