Estimation of a quadrature cross-correlation detector by analog, polarity-coincidence, and relay methods. - Ashok K. Gupta; W. P. Birkemeier (IEEE Trans. Inf. Theory, 1984)

A new recursive filter for systems with multiplicative noise. - B. S. Chow; W. P. Birkemeier (IEEE Trans. Inf. Theory, 1990)