@article{CMH_1991__66_4_140236,
     author = {H.E.A. Campbell and I. Hughes},
     title = {On the ring of invariants of {F*2n.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {322--332},
     publisher = {mathdoc},
     volume = {66},
     number = {4},
     year = {1991},
     url = {http://geodesic.mathdoc.fr/item/CMH_1991__66_4_140236/}
}