Existence of periodic solutions for higher order difference equations containing both many advances and retardations
Crossref DOI link: https://doi.org/10.1007/s13398-017-0376-9
Published Online: 2017-01-10
Published Print: 2018-01
Update policy: https://doi.org/10.1007/springer_crossmark_policy
Xia, Fei
License valid from 2017-01-10