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The design procedure of the observers is given and demonstrated on a numerical example.<\/jats:p>","DOI":"10.1515\/amcs-2017-0017","type":"journal-article","created":{"date-parts":[[2017,7,13]],"date-time":"2017-07-13T10:01:43Z","timestamp":1499940103000},"page":"245-251","source":"Crossref","is-referenced-by-count":14,"title":["Reduced\u2013Order Perfect Nonlinear Observers of Fractional Descriptor Discrete\u2013Time Nonlinear Systems"],"prefix":"10.61822","volume":"27","author":[{"given":"Tadeusz","family":"Kaczorek","sequence":"first","affiliation":[{"name":"Faculty of Electrical Engineering Bia\u0142ystok Technical University, Wiejska 45D, 15-351 Bia\u0142ystok , Poland"}]}],"member":"37438","published-online":{"date-parts":[[2017,7,8]]},"reference":[{"key":"2021040704585769793_j_amcs-2017-0017_ref_001_w2aab2b8c28b1b7b1ab1ab1Aa","doi-asserted-by":"crossref","unstructured":"Cuihong, W. (2012). 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