@article{SF_1976__13_134211,
     author = {B. Fuchssteiner},
     title = {On exposed semigroup homomorphisms.},
     journal = {Semigroup forum},
     pages = {189--204},
     publisher = {mathdoc},
     volume = {13},
     year = {1976},
     zbl = {0355.20072},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134211/}
}