Teixera, Marcelo C M [UNESP]2014-05-272014-05-271989-07-01Proceedings of the IEEE, v. 77, n. 7, p. 1092-, 1989.0018-9219http://hdl.handle.net/11449/63906An adaptive scheme is shown by the authors of the above paper (ibid. vol. 71, no. 2, pp. 275-276, Feb. 1983) for continuous time model reference adaptive systems (MRAS), where relays replace the usual multipliers in the existing MRAS. The commenter shows an error in the analysis of the hyperstability of the scheme, such that the validity of this configuration becomes an open question.1092engControl Systems, RelaySystem Stability--AnalysisHyperstability AnalysisModel Reference Adaptive Systems (MRAS)Control Systems, AdaptiveArtigo10.1109/5.30757Acesso restrito2-s2.0-0024702791