1. C.I. Byrnes and A. Isidori, A frequency domain philosophy for nonlinear systems, with applications to stabilization and to adaptive control, Preprints of the 23rd IEEE Conference on Decision and Control, 1984, 1569–1573.
2. C. I. Byrnes and A. Isidori, Global feedback stabilization of nonlinear systems. Preprints of the 24:th IEEE Conference on Decision and Control, 1985, 1031–37.
3. Lect. Notes Control Inform. Sci.;PE Crouch,1988
4. Lect. Notes Control Inform. Sci.;S Diop,1989
5. M. Fliess, A new approach to the structure at infinity of nonlinear systems, Systems and Control Letters 7, 1986, 419–421.