@article{01760361, title = {A proof of Atiyah's conjecture on configurations of four points in Euclidean three-space.}, journal = {Geometry \& Topology}, volume = {5}, year = {2001}, pages = {885-893}, doi = {10.2140/gt.2001.5.885}, zbl = {1002.51013}, language = {en}, url = {http://dml.mathdoc.fr/item/01760361} }
Eastwood, Michael; Norbury, Paul. A proof of Atiyah's conjecture on configurations of four points in Euclidean three-space.. Geometry & Topology, Tome 5 (2001) pp. 885-893. doi : 10.2140/gt.2001.5.885. http://gdmltest.u-ga.fr/item/01760361/