The Synthesis of Recursive Digital Filters. - Howard Holtz; Cornelius T. Leondes (J. ACM, 1966)

An approach to solving linear constant coefficient difference and differential equations. - Howard Holtz; Bonita J. Campbell (IEEE Trans. Acoust. Speech Signal Process., 1990)

The design of FIR and IIR filters which are equivalent to a least-squares process. - Howard Holtz; Bonita J. Campbell (IEEE Trans. Signal Process., 1993)