@article{SF_1984__28_134637,
     author = {C.J. Maxson and A. Oswald},
     title = {On the {Centralizer} of a semigroup of group endomorphisms.},
     journal = {Semigroup forum},
     pages = {29--46},
     publisher = {mathdoc},
     volume = {28},
     year = {1984},
     zbl = {0524.16012},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__28_134637/}
}