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Some new algebraic and graphical characterizations of the observability for the first\u2010order MASs are established based on agreement protocols. Moreover, under the same leader\u2010following framework with the predefined topology and leader assignment, the observability conditions for systems of double\u2010integrator and high\u2010integrator agents are also obtained. Finally, the effectiveness of the theoretical results is verified by numerical examples and simulations.<\/jats:p>","DOI":"10.1155\/2019\/9487574","type":"journal-article","created":{"date-parts":[[2019,11,5]],"date-time":"2019-11-05T23:33:18Z","timestamp":1572996798000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["On the Observability of Leader\u2010Based Multiagent Systems with Fixed Topology"],"prefix":"10.1155","volume":"2019","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4082-9692","authenticated-orcid":false,"given":"Bo","family":"Liu","sequence":"first","affiliation":[]},{"given":"Ningsheng","family":"Xu","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7321-2923","authenticated-orcid":false,"given":"Housheng","family":"Su","sequence":"additional","affiliation":[]},{"given":"Licheng","family":"Wu","sequence":"additional","affiliation":[]},{"given":"Jiahui","family":"Bai","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2019,11,5]]},"reference":[{"key":"e_1_2_9_1_2","doi-asserted-by":"publisher","DOI":"10.1145\/37402.37406"},{"key":"e_1_2_9_2_2","doi-asserted-by":"publisher","DOI":"10.2307\/1543482"},{"key":"e_1_2_9_3_2","doi-asserted-by":"publisher","DOI":"10.1109\/tcyb.2018.2859436"},{"key":"e_1_2_9_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.neucom.2018.10.077"},{"key":"e_1_2_9_5_2","doi-asserted-by":"publisher","DOI":"10.1109\/tac.2004.834113"},{"key":"e_1_2_9_6_2","doi-asserted-by":"publisher","DOI":"10.1155\/2017\/6125102"},{"key":"e_1_2_9_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.amc.2019.04.079"},{"key":"e_1_2_9_8_2","doi-asserted-by":"publisher","DOI":"10.1109\/tac.2008.919548"},{"key":"e_1_2_9_9_2","doi-asserted-by":"publisher","DOI":"10.1007\/s11432-009-0185-7"},{"key":"e_1_2_9_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/rnc.1713"},{"key":"e_1_2_9_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.amc.2013.12.020"},{"key":"e_1_2_9_12_2","doi-asserted-by":"publisher","DOI":"10.1109\/tac.2014.2335971"},{"key":"e_1_2_9_13_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jfranklin.2016.06.027"},{"key":"e_1_2_9_14_2","doi-asserted-by":"publisher","DOI":"10.1007\/s11432-016-0498-8"},{"key":"e_1_2_9_15_2","doi-asserted-by":"publisher","DOI":"10.1049\/iet-cta.2017.0870"},{"key":"e_1_2_9_16_2","doi-asserted-by":"publisher","DOI":"10.1155\/2018\/7831317"},{"key":"e_1_2_9_17_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.amc.2019.06.036"},{"key":"e_1_2_9_18_2","doi-asserted-by":"publisher","DOI":"10.1109\/tcyb.2016.2549034"},{"key":"e_1_2_9_19_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.isatra.2018.12.011"},{"key":"e_1_2_9_20_2","doi-asserted-by":"publisher","DOI":"10.1002\/rnc.3870"},{"key":"e_1_2_9_21_2","doi-asserted-by":"crossref","unstructured":"TannerH. 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