@article{urn:eudml:doc:38874, title = {Interior idempotents and non-representability of groupoids.}, journal = {Stochastica}, volume = {7}, year = {1983}, pages = {5-10}, zbl = {0572.39006}, mrnumber = {MR0766886}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:38874} }
Krause, Gerianne M. Interior idempotents and non-representability of groupoids.. Stochastica, Tome 7 (1983) pp. 5-10. http://gdmltest.u-ga.fr/item/urn:eudml:doc:38874/