1. Solution of the matrix equation AX + XB = C;Bartels;Comm. ACM,1972
2. Fleming, P. J. (1979). A CAD program for suboptimal linear regulators. Proc. IFAC Symposium on Computer-Aided Design of Control Systems, Zurich, 259–266.
3. Fleming, P. J. (1981). A CAD program for suboptimal linear regulators. Proc. IASTED Symposium on Modeling, Identification and Control, 136–140.
4. Function minimization by conjugate gradients;Fletcher;Comput. J.,1964
5. Koenigsberg, W. D. and D. K. Frederick (1970). Output feedback control with application to unstable linear systems. Proc. Joint Automatic Control Conference 1970, 674–682.