1. Carmichael, Pritchard, Quinn State and parameter estimation for non linear systems to appear in Appl. Math. and Opt.
2. Quinn Degree theory and fixed point theorems in non linear control;Carmichael,1981
3. Infinite dimensional linear systems theory;Curtain,1978
4. A general theory of observation and control;Dolecki;SIAM Jnl. Control and Opt.,1977
5. Controle optimale des systemes gouvernes par des equations aux derivees partielles;Lions,1968