@article{SF_1993__46_1_135221,
     author = {P.A. Grillet},
     title = {A short proof of {R\'edei's} {Theorem.}},
     journal = {Semigroup forum},
     pages = {126--127},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {1993},
     zbl = {0821.20051},
     url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135221/}
}