The Editor and the Publisher of Chaos are retracting the referenced publication,1 which was submitted as part of a Focus Issue on Fractional Differential Operators. The peer review process for this article was compromised and, in addition, the article contains substantial commentary on work published in Communications in Nonlinear Science and Numerical Simulation.2 This violates Chaos' policy which states that only comments on articles published in Chaos may be considered for publication. Finally, there are claims in the conclusions of Ref. 1, suggesting that the author of Ref. 2 manipulated results. The journal has no evidence to support these claims. For these reasons, this article has been retracted.

2.
R.
Garrappa
,
Commun. Nonlinear Sci. Numer. Simul.
70
,
302
306
(
2019
).