1. and , ‘Design for multi-input nonlinear systems’, in and (eds), Geometric Control Theory, Birkhauser, Boston, MA, 1983, pp. 268–297.
2. Electric Power System Dynamics, Academic, New York, 1985, pp. 109–118.
3. and , ‘Robust control of a field voltage in a synchronous generator’, Prepr. IFAC Int. Symp. on Power Systems, Brussels, 1988, pp. 1.2.1–1.2.6.
4. An example of a nonlinear regulator