This page is a placeholder. The address is printed in the book and resolves, which is the part that had to be true first; the data is not here yet.
When it is, it will be the book's reference list as machine-readable data:
Until then, every source the book relies on for a computed number is cited in the chapter that uses it, and the code that produces the number is in the repository.
If you followed a printed address here expecting the list, that is worth knowing about — the errata page says how to report it.