HHGG in Cosmology

In Don Page’s paper Return of the Boltzmann Brains:

For example, in [37] I made the estimate that the probability per 4-volume for a brief brain is \Gamma_{1B} \sim {e^{-10}}^{42}, where the upper exponent had already been predicted 33 years ago [42].

The relevant citation:

[42] D. Adams, The Hitchhiker’s Guide to the Galaxy (Pan Books, London, 1979).

Having skimmed the paper, I missed the whole “33 years ago” joke, and only went back to look for it when I skimmed through the citations and saw HHGG in it as #42. Notably, the paper has exactly 42 citations.

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