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Multimodal Hub-and-Spoke Network Design Problems to Integrate Urban Air Mobility and High-Speed Rail Services: A Semi-Quadratic Assignment Formulation and its Linearization

Crossref DOI link: https://doi.org/10.1007/s40864-026-00270-2

Published Online: 2026-05-09

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

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