1. BRYSON , A. E. , and FRAZIER , M. , 1963 ,Proc. Optimum System Synthesis Conf., Report ASD-TDR-63-119 , pp. 353 – 364 .
2. FRASER , D. C. , 1967 , Ph.D. dissertation , Department of Aeronautics and Astronautics, Massachusetts Institute of Technology . Cambridge , U.S.A.
3. Reduced-order estimation Part 2. Smoothing
4. An innovations approach to least-squares estimation--Part II: Linear smoothing in additive white noise