%0 Journal Article %A Nagano, Koichi %A Shioya, Takashi %A Yamaguchi, Takao %T Two-dimensional metric spaces with curvature bounded above, I %J Geometry & topology %D 2024 %P 3023-3093 %V 28 %N 7 %U http://geodesic.mathdoc.fr/articles/10.2140/gt.2024.28.3023/ %R 10.2140/gt.2024.28.3023 %F 10_2140_gt_2024_28_3023