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Retraction Note: Optimizing Knowledge-Driven Competition: Analyzing Product Differentiation in the Physical Education and Sports Training Oligopoly Market Using the Hotelling Model

Crossref DOI link: https://doi.org/10.1007/s13132-025-02978-1

Published Online: 2025-11-21

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

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