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@article{CM_1989__70_1_13_0, author = {Shepherd-Barron, N. I.}, title = {Invariant theory for $S_5$ and the rationality of $M_6$}, journal = {Compositio Mathematica}, pages = {13--25}, publisher = {Kluwer Academic Publishers}, volume = {70}, number = {1}, year = {1989}, mrnumber = {993171}, zbl = {0704.14044}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1989__70_1_13_0/} }
Shepherd-Barron, N. I. Invariant theory for $S_5$ and the rationality of $M_6$. Compositio Mathematica, Tome 70 (1989) no. 1, pp. 13-25. http://geodesic.mathdoc.fr/item/CM_1989__70_1_13_0/