Information and distortion in reduced-order filter design. - Jorge I. Galdos; Donald E. Gustafson (IEEE Trans. Inf. Theory, 1977)

A lower bound on filtering error with application to phase demodulation. - Jorge I. Galdos (IEEE Trans. Inf. Theory, 1979)

Nonlinear filtering lower bound evaluation of passive tracking systems. - Jorge I. Galdos; T. Sen Lee (ICASSP, 1980)

A rate distortion theory lower bound on desired function filtering error. - Jorge I. Galdos (IEEE Trans. Inf. Theory, 1981)