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Fixed point for $$\alpha $$ α - $$\varTheta $$ Θ - $$\varPhi $$ Φ -contractions and first-order periodic differential problem

Crossref DOI link: https://doi.org/10.1007/s13398-018-0586-9

Published Online: 2018-10-08

Published Print: 2019-07

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