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At the end of this article we present some extensions of these results to an infinite-dimensional vector space.<\/jats:p>","DOI":"10.1137\/080744219","type":"journal-article","created":{"date-parts":[[2010,7,20]],"date-time":"2010-07-20T18:07:15Z","timestamp":1279649235000},"page":"4474-4480","source":"Crossref","is-referenced-by-count":15,"title":["Some Equivalent Results with Yakubovich's\n                    <i>S<\/i>\n                    -Lemma"],"prefix":"10.1137","volume":"48","author":[{"given":"Yan","family":"Zi-zong","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guo","family":"Jin-hai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"351","published-online":{"date-parts":[[2010,7,20]]},"reference":[{"key":"R1","unstructured":"M. A. Aizerman and F. R. Gantmacher,\n                      Absolute stability of regulator systems\n                      , in Holden-Day Ser. 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