@article{10_1017_S0017089500009630,
     author = {Silva, Pedro V.},
     title = {Normal-convex embeddings of inverse semigroups},
     journal = {Glasgow mathematical journal},
     pages = {115--121},
     year = {1993},
     volume = {35},
     number = {1},
     doi = {10.1017/S0017089500009630},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500009630/}
}