The Design of Nonlinear Filters and Control Systems. Part I - Jacob Katzenelson; Leonard A. Gould (Inf. Control., 1962)

The Design of Nonlinear Filters and Control Systems. Part II - Jacob Katzenelson; Leonard A. Gould (Inf. Control., 1964)

A Spectrum Factorization Method for the Calculation of Nonlinear Filters of the Volterra Type - Jacob Katzenelson; Leonard A. Gould (Inf. Control., 1965)

A Note on "A Spectrum Factorization Method for the Calculation of Nonlinear Filters of the Volterra Type" - Jacob Katzenelson; Leonard A. Gould (Inf. Control., 1966)