1. Craig J.J. , Introduction to robotics: Mechanics and control. Pearson/Prentice Hall, Upper Saddle River (2005).
2. Khalil H.K. , Nonlinear control. Prentice Hall, Upper Saddle River, New Jersey (1996).
3. Åström K.J. and Wittenmark B. , Adaptive control. Dover Publications, Mineola, New York(2008).
4. Variable structure systems with sliding modes;Utkin;IEEE Transactions on Automatic Control,1977