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We remark that since the differential system is only continuous we cannot apply to it the classical averaging theory, that needs that the differential system be at least of class [Formula: see text]. <\/jats:p>","DOI":"10.1142\/s0218127420501588","type":"journal-article","created":{"date-parts":[[2020,9,22]],"date-time":"2020-09-22T10:04:47Z","timestamp":1600769087000},"page":"2050158","source":"Crossref","is-referenced-by-count":0,"title":["Periodic Solutions of Continuous Third-Order Differential Equations with Piecewise Polynomial Nonlinearities"],"prefix":"10.1142","volume":"30","author":[{"given":"J.","family":"Llibre","sequence":"first","affiliation":[{"name":"Departament de Matem\u00e0tiques, Universitat Aut\u00f2noma de Barcelona, 08193 Bellaterra, Barcelona, Catalonia, Spain"}]},{"given":"B. D.","family":"Lopes","sequence":"additional","affiliation":[{"name":"Centro de Matem\u00e1tica, Computa\u00e7\u00e3o e Cogni\u00e7\u00e3o, Universidade Federal do ABC, 09210\u2013170, Santo Andr\u00e9, S\u00e3o Paulo, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7722-6644","authenticated-orcid":false,"given":"J. R.","family":"de Moraes","sequence":"additional","affiliation":[{"name":"Curso de Matem\u00e1tica, Universidade Estadual de Mato Grosso do Sul, 79804\u2013970, Dourados, Mato Grosso do Sul, Brazil"}]}],"member":"219","published-online":{"date-parts":[[2020,9,21]]},"reference":[{"key":"S0218127420501588BIB001","doi-asserted-by":"publisher","DOI":"10.1016\/j.cam.2016.08.047"},{"key":"S0218127420501588BIB002","doi-asserted-by":"publisher","DOI":"10.1002\/mma.3842"},{"key":"S0218127420501588BIB003","doi-asserted-by":"publisher","DOI":"10.1090\/S0273-0979-1983-15153-4"},{"key":"S0218127420501588BIB004","doi-asserted-by":"publisher","DOI":"10.3934\/cpaa.2007.6.103"},{"key":"S0218127420501588BIB005","doi-asserted-by":"publisher","DOI":"10.1016\/j.chaos.2015.11.003"},{"volume-title":"Table of Integrals, Series, and Products","year":"2007","author":"Gradshteyn I. 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