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Bifurcation Chaos"],"published-print":{"date-parts":[[2022,5]]},"abstract":"<jats:p> This paper focuses on the weak bi-center and bifurcation of critical periods in a class of three-dimensional quadratic systems with a special type of symmetry. Center manifold theory is applied to prove that the system admits either a rough bi-center or a weak bi-center of infinite order (i.e. isochronous bi-center) rather than a weak bi-center of finite order. 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