Retraction notice to “Periodic Solutions of Second Order Impulsive Differential Equations at Resonance via Variational Approach” [Math. Model. Anal. 19(5):664–675, 2014]

Abstract

The following article is being retracted from publication in Mathematical Modelling and Analysis Journal:
Periodic Solutions of Second Order Impulsive Differential Equations at Resonance via Variational Approach, by
Jin Li, Jianlin Luo and Zaihong Wang,
Volume 19, Issue 5, 2014, pp. 664–675,
Mathematical Modelling and Analysis, DOI: 10.3846/13926292.2014.980864
http://www.tandfonline.com/doi/abs/10.3846/13926292.2014.980864
Received 10 February 2014, published online 24 November 2014,
since the same results are published in Springer article
Andesman-Lazer type condition for second-order differential equations at resonance with impulsive effects, by
Jin Li and Meilin Zheng,
Advances in Difference Equations, DOI: 10.1186/1687-1847-2014-235
http://www.advancesindifferenceequations.com/content/2014/1/235
Received 10 June 2014, published 9 September 2014.

The Editors and publishers of the journal, Taylor & Francis, note that we received, peer-reviewed, accepted and published the article on the basis that the authors are presenting original results and are not intending to publish them in any other journal.
The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “retracted”.