@article{GDZPPN001249290,
title = {The dual ordinal of a bisimple inverse semigroup.},
journal = {Semigroup forum},
volume = {7},
year = {1974},
pages = {295-297},
zbl = {0267.20055},
url = {http://dml.mathdoc.fr/item/GDZPPN001249290}
}
White, G.L. The dual ordinal of a bisimple inverse semigroup.. Semigroup forum, Tome 7 (1974) pp. 295-297. http://gdmltest.u-ga.fr/item/GDZPPN001249290/