@article{GT_2024_28_7_a6,
     author = {Lytchak, Alexander and Nagano, Koichi and Stadler, Stephan},
     title = {CAT(0) 4{\textendash}manifolds are {Euclidean}},
     journal = {Geometry & topology},
     pages = {3285--3308},
     publisher = {mathdoc},
     volume = {28},
     number = {7},
     year = {2024},
     doi = {10.2140/gt.2024.28.3285},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2024.28.3285/}
}