Absolutely flat idempotents.
Johnson, Charles R. ; Harel, Yonatan ; Hillar, Christopher J. ; Groves, Jonathan M. ; Rault, Patrick X.
ELA. The Electronic Journal of Linear Algebra [electronic only], Tome 10 (2003), p. 190-200 / Harvested from The Electronic Library of Mathematics
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Publié le : 2003-01-01
EUDML-ID : urn:eudml:doc:123679 
@article{02042856,
     title = {Absolutely flat idempotents.},
     journal = {ELA. The Electronic Journal of Linear Algebra [electronic only]},
     volume = {10},
     year = {2003},
     pages = {190-200},
     zbl = {1042.15008},
     language = {en},
     url = {http://dml.mathdoc.fr/item/02042856}
}

Johnson, Charles R.; Harel, Yonatan; Hillar, Christopher J.; Groves, Jonathan M.; Rault, Patrick X. Absolutely flat idempotents.. ELA. The Electronic Journal of Linear Algebra [electronic only], Tome 10 (2003) pp. 190-200. http://gdmltest.u-ga.fr/item/02042856/