@article{1028999848, author = {Pearcy, Carl and Topping, David}, title = {Sums of small numbers of idempotents.}, journal = {Michigan Math. J.}, volume = {14}, number = {1}, year = {1967}, pages = { 453-465}, language = {en}, url = {http://dml.mathdoc.fr/item/1028999848} }
Pearcy, Carl; Topping, David. Sums of small numbers of idempotents.. Michigan Math. J., Tome 14 (1967) no. 1, pp. 453-465. http://gdmltest.u-ga.fr/item/1028999848/