Correction to "Canonical forms for the identification of multivariable linear systems"

In the above-named article [ibid., vol. AC-19, pp. 646-656, Dec. 1974], an omission in the statement of Lemma 3 is corrected. In addition, the author of a subsequent paper [D.Q. Mayne, "Canonical forms for identification" in New Directions in Signal Proressing in Communication and Comrol, NATO Advanced Study Institute Series. Boston. MA, USA: Reldel, 1974] points out that this error has been reproduced therein as a result of the original omission.