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Retraction Note: Sharp geometrical properties of a-rarefied sets via fixed point index for the Schrödinger operator equations
Fixed Point Theory and Applications volume 2020, Article number: 2 (2020)
The Editors-in-Chief have retracted this article  because it overlaps significantly with a number of previously published articles from different authors [2–4] and one article by different authors that was simultaneously under consideration with another journal . The article also showed evidence of peer review manipulation. Additionally, the identity of the corresponding author could not be verified: Roskilde University have confirmed that Beatriz Ychussie has not been affiliated with their institution. The authors have not responded to any correspondence with regards to this retraction.
Li, Z., Ychussie, B.: Fixed Point Theory Appl. 2015, 89 (2015). https://doi.org/10.1186/s13663-015-0342-1
Xue, G.: Rarefied sets at infinity associated with the Schrödinger operator. J. Inequal. Appl. 2014, 247 (2014). https://doi.org/10.1186/1029-242X-2014-247
Zhao, T., Yamada, A.: Growth properties of Green–Sch potentials at infinity. Bound. Value Probl. 2014, 245 (2014). https://doi.org/10.1186/s13661-014-0245-9
Zhao, T.: Minimally thin sets associated with the stationary Schrödinger operator. J. Inequal. Appl. 2014, 67 (2014). https://doi.org/10.1186/1029-242X-2014-67
Xue, G., Yuzbasi, E.: Fixed point theorems for solutions of the stationary Schrödinger equation on cones. Fixed Point Theory Appl. 2015, 34 (2015). https://doi.org/10.1186/s13663-015-0275-8
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Li, Z., Ychussie, B. Retraction Note: Sharp geometrical properties of a-rarefied sets via fixed point index for the Schrödinger operator equations. Fixed Point Theory Appl 2020, 2 (2020). https://doi.org/10.1186/s13663-020-0671-6