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2. E.Y. Chow and A.S. Willsky, "Analytical Redundancy and the Design of Robust Failure Detection Systems," to appear in the IEEE Trans. on Aut. Control.
3. X.-C. Lou, "A System Failure Detection Method: The Failure Projection Method," S.M. Thesis M.I.T. Dept. of Elec. Eng. and Comp. Sci.; also Rept. LIDS-TH-1203, M.I.T. Lab. for Inf. and Dec. Sys., June 1982.
4. A.S. Willsky, "Failure Detection in Dynamic Systems," AGARD Lecture Series No. 109 on Fault Tolerance Design and Redundancy Management Techniques," Athens, Rome, and London, Oct. 1980.
5. J.C. Deckert, M.N. Desai, J.J. Deyst, and A.S. Willsky, "F8-DFBW Sensor Failure Detection and Identification Using Analytic Redundancy," IEEE Trans. Aut. Control, Vol. AC-22, No. 5, Oct. 1977, pp. 795–803.