Updates are available Correction dated 2015-05-16

Click to view Correction: https://doi.org/10.1186/s13661-015-0339-z

Periodic solution of second-order impulsive delay differential system via generalized mountain pass theorem

Crossref DOI link: https://doi.org/10.1186/s13661-014-0234-z

Published Online: 2014-11-06

Published Print: 2014-12

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