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Under these conditions, the approximate controllability of the associated fractional evolution systems involving Riemann--Liouville fractional derivatives is formulated and proved.<\/jats:p>","DOI":"10.1137\/120903853","type":"journal-article","created":{"date-parts":[[2015,7,16]],"date-time":"2015-07-16T13:25:18Z","timestamp":1437053118000},"page":"1920-1933","source":"Crossref","is-referenced-by-count":128,"title":["Approximate Controllability of Fractional Evolution Systems with Riemann--Liouville Fractional Derivatives"],"prefix":"10.1137","volume":"53","author":[{"given":"Zhenhai","family":"Liu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiuwen","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"351","published-online":{"date-parts":[[2015,7,16]]},"reference":[{"key":"atypb1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jde.2009.03.004"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1016\/j.nonrwa.2008.10.058"},{"key":"atypb3","doi-asserted-by":"publisher","DOI":"10.1016\/j.jfranklin.2008.08.001"},{"key":"atypb4","doi-asserted-by":"publisher","DOI":"10.1016\/j.na.2010.07.035"},{"key":"atypb5","doi-asserted-by":"publisher","DOI":"10.1007\/s00397-005-0043-5"},{"key":"atypb6","first-page":"190","volume":"1","author":"Kalman R. 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