@article{10_1017_S0017089500003475,
     author = {Howie, J. M.},
     title = {Idempotents in completely 0-simple semigroups},
     journal = {Glasgow mathematical journal},
     pages = {109--113},
     year = {1978},
     volume = {19},
     number = {2},
     doi = {10.1017/S0017089500003475},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500003475/}
}