1. Theory and Applications of Volterra Operators in Hilbert Space;Gohberg;Amer. Math. Soc., Providence R.I,1970
2. New results in linear filtering and prediction theory;Kaiman;J. Basic Eng., Trans, ASME, Ser. D,1961
3. Fredholm resolvents, Wiener-Hopf equations and Riccati differential equations;Kailath;IEEE Trans. Inform. Theory,1969
4. On the equivalence between matrix Riccati equations and Fredholm resolvents;Schumitzky;J. Comp. Sys. Science,1968
5. Use of operator factorization for linear control and estimation;Hagander;Automatica,1973