@article{10_21136_CMJ_1985_102031,
     author = {Sullivan, Robert P.},
     title = {Half-automorphisms of transformation semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {415--418},
     publisher = {mathdoc},
     volume = {35},
     number = {3},
     year = {1985},
     doi = {10.21136/CMJ.1985.102031},
     mrnumber = {803036},
     zbl = {0589.20047},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1985.102031/}
}