ALGEBRAIC RICCATI-EQUATIONS ARISING FROM SYSTEMS WITH UNBOUNDED INPUTSOLUTION OPERATOR - APPLICATIONS TO BOUNDARY CONTROL-PROBLEMS FOR WAVE AND PLATE EQUATIONS
I. Lasiecka et R. Triggiani, ALGEBRAIC RICCATI-EQUATIONS ARISING FROM SYSTEMS WITH UNBOUNDED INPUTSOLUTION OPERATOR - APPLICATIONS TO BOUNDARY CONTROL-PROBLEMS FOR WAVE AND PLATE EQUATIONS, Nonlinear analysis, 20(6), 1993, pp. 659-695