B. Bede, Mathematics of Fuzzy Sets and Fuzzy Logic, Springer, Berlin, 2013.
 M. Biglarbegian, A. Sadeghian and W. Melek, On the accessibility/ controllability of fuzzy
control systems, Information Science, 202 (2012), 58-72.
 Z. Cai and S. Tang, Controllability and robustness of T-fuzzy control systems under direc-
tional disturbance, Fuzzy Sets and Systems, 115 (2000), 279-285.
 Z. Ding and A. Kandel, On the controllability of fuzzy dynamical systems (I), Journal of
Fuzzy Mathematics, 8(1) (2000), 203-214.
 Z. Ding and A. Kandel, On the controllability of fuzzy dynamical systems (II), Journal of
Fuzzy Mathematics, 8(2) (2000), 295-306.
 Z. Ding, M. Ma and A. Kandel, On the observability of fuzzy dynamical control systems (I),
Fuzzy Sets and Systems, 111(2) (2000), 225-236.
 S. S. Farinwata and G. Vachtsevanos, Survey on the controllability of fuzzy logic systems,
Proceedings of 32th IEEE Conference on Decision and Control, (1993), 1749-1750.
 Y. Feng and L. Hua, On the quasi-controllability of continuous-time dynamic fuzzy control
systems, Chaos, Solitons and Fractals, 30(1) (2006), 177-188.
 M. Friedman, Ma Ming and A. Kandel, Fuzzy linear systems, Fuzzy Sets and Systems, 96
 W. I. Gabr, A new approach for automatic control modelling, analysis and design in fully
fuzzy environment, Ain Shams Engineering Journal, 6 (2015), 835-850.
 M. M. Gupta, Controllability of fuzzy control systems, IEEE Transactions on Systems, Man,
and Cybernetics, 16 (1985), 576-582.
 A. Kumar, J. Kaur and P. Singh, A new method for solving fully fuzzy linear programming
problems, Applied Mathematics and Computation, 35 (2011), 817-823.
 A. Mansoori, S. Effati and M. Eshaghnezhad, A neural network to solve quadratic pro-
gramming problems with fuzzy parameters, Fuzzy Optimization and Decision Making, 17(1)
 M. S. N. Murty and G. Suresh Kumar, On Controllability and Observability of Fuzzy Dy-
namical Matrix Lyapunov Systems, Advances in Fuzzy Systems, 8(1) (2008), 1-16.
 K. Ogata, Modern Control Engineering, Fourth ed., Prentice Hall, New Jersey, 2002.
 L. Stefanini, A generalization of Hukuhara difference and division for interval and fuzzy
arithmetic, Fuzzy Sets and Systems 161(11) (2010), 1564-1584.
 C. Tetiana and Z. Alexander, Application of the return method to the steering of nonlinear
systems, in: Krzysztof Kozlowski (Ed.), Robot Motion and Control 2009, Lecture Notes in
Control and Information Sciences, vol. 396, Springer, Berlin/Heidelberg, (2009), 83-91.
 L. X. Wang, A Course in Fuzzy Systems and Control, Prentice Hall PTR, 1997.