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By using the Picard\u2013Fuchs equation, we obtain the upper bounds of the number of limit cycles bifurcating from the period annuli of the quadratic isochronous systems [Formula: see text], [Formula: see text] and [Formula: see text], [Formula: see text], when they are perturbed inside a class of all discontinuous polynomial differential systems of degree [Formula: see text]. This method can be applied to study the limit cycle bifurcations of other integrable differential systems. <\/jats:p>","DOI":"10.1142\/s021812742050042x","type":"journal-article","created":{"date-parts":[[2020,3,30]],"date-time":"2020-03-30T09:34:46Z","timestamp":1585560886000},"page":"2050042","source":"Crossref","is-referenced-by-count":9,"title":["Picard\u2013Fuchs Equation Applied to Quadratic Isochronous Systems with Two Switching Lines"],"prefix":"10.1142","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6738-2777","authenticated-orcid":false,"given":"Jihua","family":"Yang","sequence":"first","affiliation":[{"name":"School of Mathematics and Computer Science, Ningxia Normal University, Xueyuan Rd. Guyuan, Ningxia, P. R. 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