The quote you chose was: '[The term] "Queer", then, can nominate specific 'homosexual' bodies, but can also mark a disturbing mobility or non-fixity between diverse sexualities.'
(Roger Luckhurst (1995), Journal of Gender Studies, vol. 4, no. 3).

 
Good guess, but this quote was from Roger Luckhurst. The clue's in the question: Judith Butler wasn't actually talking about "queer" in 1990.
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