1. S. Dormido Bencomo: Annual Reviews in Control Vol. 28 (2004), pp.115-136.
2. C.S. Peek, O.D. Crisalle, S. Depraz and D. Gillet: Int. J. Engng Ed. Vol. 21 (2005), pp.1134-1147.
3. Z. Yi, J. Jian-Jun and F. Shao-Chun: Int. J. Engng Ed. Vol. 21 (2005), pp.94-102.
4. N. Ertugrul: Int. J. Engng Ed. Vol. 16 (2000), pp.171-180.
5. A. Grau and Y. Bolea: IEEEXplore (2007), pp.1188-1193.