Periodic solutions for nonautonomous first order delay differential systems via Hamiltonian systems
Crossref DOI link: https://doi.org/10.1186/s13662-015-0456-0
Published Online: 2015-04-30
Published Print: 2015-12
Update policy: https://doi.org/10.1007/springer_crossmark_policy
Meng, Qiong
License valid from 2015-04-30