Highly Dynamic and Flexible Spatio-Temporal Spectrum Management with AI-Driven O-RAN: A Multi-Granularity Marketplace Framework. - Mehdi Rasti; Elaheh Ataeebojd; Shiva Kazemi Taskooh; Mehdi Monemi; Siavash Razmi; Matti Latva-aho (CoRR, 2025)