@article{SF_1990__40_1_135008,
     author = {P.M. Higgins},
     title = {Embedding in bisimple semigroups.},
     journal = {Semigroup forum},
     pages = {105--108},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {1990},
     zbl = {0691.20048},
     url = {http://geodesic.mathdoc.fr/item/SF_1990__40_1_135008/}
}