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Then we conjecture that the system has no limit cycles using the second variation of the displacement function expressed for continuous functions. This system can be seen as a feedback system in control theory.<\/jats:p>","DOI":"10.1142\/s0218127407020087","type":"journal-article","created":{"date-parts":[[2008,3,11]],"date-time":"2008-03-11T10:35:40Z","timestamp":1205231740000},"page":"4425-4429","source":"Crossref","is-referenced-by-count":5,"title":["A NOTE ON A PIECEWISE-LINEAR DUFFING-TYPE SYSTEM"],"prefix":"10.1142","volume":"17","author":[{"given":"GHEORGHE","family":"TIGAN","sequence":"first","affiliation":[{"name":"Department of Mathematics, \"Politehnica\" University of Timisoara, P-ta Victoriei, Nr.2, 300006, Timisoara, Timis, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"ALESSANDRO","family":"ASTOLFI","sequence":"additional","affiliation":[{"name":"Electrical and Electronic Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"219","published-online":{"date-parts":[[2011,11,20]]},"reference":[{"key":"rf1","volume-title":"Theory of Oscillations","author":"Andronov A.","year":"1996"},{"key":"rf2","doi-asserted-by":"publisher","DOI":"10.1137\/1036094"},{"key":"rf3","doi-asserted-by":"publisher","DOI":"10.1016\/S0960-0779(99)00148-4"},{"key":"rf4","doi-asserted-by":"crossref","first-page":"199","DOI":"10.1090\/trans2\/042\/13","volume":"42","author":"Filippov A. 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