@article{02105188, title = {Nonpositively curved 2-complexes with isolated flats.}, journal = {Geometry \& Topology}, volume = {8}, year = {2004}, pages = {205-275}, doi = {10.2140/gt.2004.8.205}, zbl = {1063.20048}, language = {en}, url = {http://dml.mathdoc.fr/item/02105188} }
Hruska, G.Christopher. Nonpositively curved 2-complexes with isolated flats.. Geometry & Topology, Tome 8 (2004) pp. 205-275. doi : 10.2140/gt.2004.8.205. http://gdmltest.u-ga.fr/item/02105188/