1. Blair, D.B., Spark, I.J., 1996. Computer controlled integrated steering/drive system for vehicles. ASME Computers in Engineering Conference, California, USA.
2. Lu, J., Spark, I.J., Vains, G.G., Spriggs, K.R., 1997. Computer integrated steering/drive systems with steering wheel control. Proceedings on I.E. Aust. Conference on Control Engineering, Sydney, Australia, p. 236–241.
3. Spark, I.J., Besselink, B.C., 1994. Zero turn radius vehicle incorporating computer-controlled ‘intelligent castors’. ASME Computers in Engineering Conference, Minneapolis, USA, Book No. G0875B, p. 825–827.
4. Spark, I.J., Ibrahim, M.Y., 2001. Integrated mechatronics solution to maximise tractability and efficiency of wheeled vehicles. IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM, Como, Italy.
5. Spark, I.J., Ibrahim, M.Y., Spriggs, K.R., 1996. Maximising the tractive effort, drive efficiency and manoeuvrability of wheeled mobile robots. Proceedings of International Conference on Robotics, Vision and Parallel Processing for Industrial Automation, Ipoh, Malaysia, p. 843–851.