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Sources

1. Wang, Liang, He Wei, Yu Guan, Libin Ouyang, DanDan Xu, Xuehua Han, Min Zhang, et al. "China Public Transport Operation Network Dataset (CPTOND-2025): National-Scale Bus-Metro Vector Dataset." Scientific Data 13, no. 188 (2026). https://doi.org/10.1038/s41597-025-06505-4.
2. Metropolitan Transportation Authority. "Developers." Accessed August 21, 2026. https://www.mta.info/developers.
3. Chicago Transit Authority. "GTFS." Accessed August 21, 2026. https://www.transitchicago.com/developers/gtfs/.
4. Île-de-France Mobilités. "Horaires au format GTFS." transport.data.gouv.fr. Accessed August 21, 2026. https://transport.data.gouv.fr/resources/80921.
5. Verkehrsverbund Berlin-Brandenburg. "Digitale Services: Datensätze." Accessed August 21, 2026. https://unternehmen.vbb.de/digitale-services/datensaetze/.
6. Bay Area Rapid Transit. "GTFS." Accessed August 21, 2026. https://www.bart.gov/schedules/developers/gtfs.
7. Interline. "Transit.land." Accessed August 21, 2026. https://www.transit.land/.