@article{SF_1996__52_3_135445,
     author = {T.S. Blyth and M.H. Almeida-Santos},
     title = {Invariant semigroups of othodox semigroups.},
     journal = {Semigroup forum},
     pages = {163--180},
     publisher = {mathdoc},
     volume = {52},
     number = {3},
     year = {1996},
     zbl = {0846.20066},
     url = {http://geodesic.mathdoc.fr/item/SF_1996__52_3_135445/}
}