Existence of positive periodic solutions of nonlinear neutral differential systems with variable delays
Crossref DOI link: https://doi.org/10.1007/s11565-017-0292-0
Published Online: 2017-08-02
Published Print: 2018-05
Update policy: https://doi.org/10.1007/springer_crossmark_policy
Gabsi, Hocine
Ardjouni, Abdelouaheb
Djoudi, Ahcene
License valid from 2017-08-02