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Existence and uniqueness of solutions for coupled system of fractional differential equations involving proportional delay by means of topological degree theory

Crossref DOI link: https://doi.org/10.1186/s13662-020-02918-0

Published Online: 2020-09-04

Published Print: 2020-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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