1. (1) M. C. Campi, A. Lecchini, and S. M. Savaresi: “Virtual Reference Feedback Tuning (VRFT): A direct method for the design of feedback controllers”, Automatica, Vol. 38, pp. 1337-1346 (2002)
2. (2) A. Lecchini, M. C. Campi, and S. M. Savaresi: “Virtual reference feedback tuning for two degree of freedom controllers”, INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING, Vol. 16, pp. 355-371 (2002)
3. (3) S. Souma, O. Kaneko, and T. Fujii: “A New Approach to Parameter Tuning of Controllers by Using One-Shot Experimental Data-A Proposal of Fictitious Reference Iterative Tuning”, Transactions of the Institute of Systems, Control, and Information Engineers, Vol. 17, No. 12, pp. 528-536 (2004) (in Japanese)
4. (4) O. Kaneko, K. Yoshida, K. Matsumoto, and T. Fujii: “A New Parameter Tuning for Controllers Based on Least-Squares Method by Using One-Shot Closed Loop Experimental Data-An Extension of Fictitious Reference Iterative Tuning”, Transactions of the Institute of Systems, Control, and Information Engineers, Vol. 18, No. 11, pp. 404-409 (2005) (in Japanese)