@article{01228295,
title = {Buildings and non-positively curved polygons of finite groups.},
journal = {The New York Journal of Mathematics [electronic only]},
volume = {3A},
year = {1998},
pages = {237-248},
zbl = {0966.20020},
language = {en},
url = {http://dml.mathdoc.fr/item/01228295}
}
Brown, Paul R. Buildings and non-positively curved polygons of finite groups.. The New York Journal of Mathematics [electronic only], Tome 3A (1998) pp. 237-248. http://gdmltest.u-ga.fr/item/01228295/