Derrida and Saussure

In the Norton Theory and criticism the editors mention Derrida's critique of
Saussure but don't provide a citation. Can someone point me to an extended
discussion of Saussure on Derrida's part? I know that Saussure is mentioned in
"Signature, Event Context" and other places but I'm assuming there's a more
extended discussion somewhere in Derrida's oeuvre. Thanks a bunch--Joe