no. 1
Invariant theory for S 5 and the rationality of M 6
Compositio Mathematica, Volume 70 (1989) no. 1, pp. 13-25. 
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Shepherd-Barron, N. I. Invariant theory for $S_5$ and the rationality of $M_6$. Compositio Mathematica, Volume 70 (1989) no. 1, pp. 13-25. http://archive.numdam.org/item/CM_1989__70_1_13_0/

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