Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.
APA4ort.xyz Knowledge Graph. (2026). The opening conditions of the metro and its early characteristics: A historical perspective. Retrieved May 24, 2026, from https://4ort.xyz/entity/the-opening-conditions-of-the-metro-and-its-early-characteristics-a-historical-perspective
MLA“The opening conditions of the metro and its early characteristics: A historical perspective.” 4ort.xyz Knowledge Graph, 4ort.xyz, 24 May. 2026, https://4ort.xyz/entity/the-opening-conditions-of-the-metro-and-its-early-characteristics-a-historical-perspective.
BibTeX@misc{4ortxyz_the-opening-conditions-of-the-metro-and-its-early-characteristics-a-historical-perspective_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{The opening conditions of the metro and its early characteristics: A historical perspective}}, year = {2026}, url = {https://4ort.xyz/entity/the-opening-conditions-of-the-metro-and-its-early-characteristics-a-historical-perspective}, note = {Accessed: 2026-05-24}}
LLM promptAccording to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): The opening conditions of the metro and its early characteristics: A historical perspective — https://4ort.xyz/entity/the-opening-conditions-of-the-metro-and-its-early-characteristics-a-historical-perspective (retrieved 2026-05-24)
