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. 2018 Sep 20;20(10):720. doi: 10.3390/e20100720

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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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Time evolution of states for $υ = 0.979$ and: (a) $(a_{1}, a_{2}, a_{3}, a_{4}) = (0.2, 0.71, 0.91, 1.14)$ and $(x (0), y (0)) = (0.93, - 0.44)$ ; (b) $(a_{1}, a_{2}, a_{3}, a_{4}) = (0.51, 1, 1.51, 0.74)$ and $(x (0), y (0)) = (- 0.81, 0.51)$ ; (c) $(a_{1}, a_{2}, a_{3}, a_{4}) = (0.6, 1, 1.6, 0.72)$ and $(x (0), y (0)) = (- 0.26, 0.18)$ .