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The authors would like to express their appreciation for the support of the United Nations Umbrella Project during the 1991 Warsaw Symposium on Implicit and Robust Systems, out of which grew this Special Issue.
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Lewis, F.L., Campbell, S.L. & Kociecki, M. Preface. Circuits Systems and Signal Process 13, 119 (1994). https://doi.org/10.1007/BF01188100
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DOI: https://doi.org/10.1007/BF01188100