@article{bacak_notion_2015,
	title = {A notion of nonpositive curvature for general metric spaces},
	volume = {38},
	journal = {Differential Geometry and its Applications},
	author = {Bačák, Miroslav and Hua, Bobo and Jost, Jürgen and Kell, Martin and Schikorra, Armin},
	year = {2015},
	pages = {22--32},
}

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