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. 2018 Jul 28;20(8):564. doi: 10.3390/e20080564

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Hidden periodic attractor of the fractional-order system (15) with $a = 0.35$ , $q = 0.996$ , and initial conditions $(x (0), y (0), z (0)) = (0, 75, - 50)$ . (a) x–y plane; (b) x–z plane; (c) y–z plane.