@article{SF_1992__44_1_135158,
     author = {S.L. Lipscomb},
     title = {Centralizers in symmetric inverse semigroups: {Structure} and order.},
     journal = {Semigroup forum},
     pages = {347--355},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1992},
     zbl = {0746.20046},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135158/}
}