1. On the general theory of control systems;Kalman;IRE Transactions on Control Systems,1959
2. Linear Estimation;Kailath,2000
3. State Functions and Linear Control Systems;Shultz,1967
4. MATEXP, a General Purpose Digital Computer Program for Solving Ordinary Differential Equations by the Matrix Exponential Method, Oak Ridge National Laboratory (ORNL), ORNL-TM-1933;Ball,1967
5. Sensitivities by the state variable method;Kerlin;Simulation 8 (6),1967