Trinh, H., and Ha, Q. (2000) Design of linear functional observers for linear systems with unknown inputs. International Journal of Systems Science, 31 (6). pp. 741-749.

Fernando, T., and Trinh, H. (2000) Output feedback controllers for linear systems with delayed perturbations. International Journal of Modelling & Simulation, 20 (1). pp. 63-68.

Ha, Q.P., and Trinh, H. (2000) A variable structure-based controller with fuzzy tuning for load-frequency control. International Journal of Power and Energy Systems, 20 (3). pp. 146-154.