# Invariant forms of a binary quintic

Does anyone have a reference for the invariant binary forms of a quintic? That is, what are the $SL_2(C)$ invariant polynomial functions on the space of binary quintics.

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Complementing Noam's answer: for $d\leq 6$ the algebras of $SL_2$-invariants of degree $d$ forms in 2 variables can be found in 10.2 of Dolgachev's Lectures on invariant theory, as well as a reference in English for $d=5$. –  algori Oct 27 '11 at 10:41