Frankowska, H. <https://pure.iiasa.ac.at/view/iiasa/1884.html> & Quincampoix, M. <https://pure.iiasa.ac.at/view/iiasa/2311.html>  (1996).  Dissipative Control Systems and Disturbance Attenuation for Nonlinear H - Problems.   IIASA Working Paper. IIASA, Laxenburg, Austria: WP-96-117