Invariant theory for $S_5$ and the rationality of $M_6$

Shepherd-Barron, N. I.

Compositio Mathematica, Volume 70 (1989) p. 13-25

The rationality of some moduli spaces of plane curves

Shepherd-Barron, N. I.

Compositio Mathematica, Volume 67 (1988) p. 51-88