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In "Foundations of
Mechanics", Ralph Abraham and Jerrold E. Marsden, 2nd edition, Benjamin/Cummings 1978, there is a phase portrait labeled "blue-sky catastrophe" on page 566-567, and that picture credits Ruelle and Takens for coming up with the idea in 1971. The reference given (I have not checked
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While the idea is clearly not as fully developed as in the scholarpedia article, it does state the basic idea: "As ÎĽ approaches zero from the left, the period of the attracting closed orbit tends to infinity." The (rather simple) picture implies that the measure evaporates to zero.
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RL Devaney 1978 "Blue sky catastrophes in reversible and
Hamiltonian systems" (preprint) but google knows all: Indiana University Mathematics Journal
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Please note that, by 1977, Devaney already has a published paper with this phrase in the title; you can google that one, it's on his website.
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