@article{PORMA_1996__53_3_47592,
     author = {Gomes, Gracinda M.S. and Howie, John M.},
     title = {A -theorem for inverse semigroups with zero.},
     journal = {Portugaliae mathematica},
     pages = {257--278},
     publisher = {mathdoc},
     volume = {53},
     number = {3},
     year = {1996},
     zbl = {0857.20046},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1996__53_3_47592/}
}