Originally Posted by ibu
When I understand it correctly there's at the moment no reader which offers a navigation interface with "Go to paragraph number 1456", right?
Right, and I don't think there will ever be. Also, as far as I know there is no reader that lets you enter an arbitrary id to "go to" there.
But many readers have a search facility, so you could write something like:
* See the arguments about "Large Scale Structure" [Hawking, 1975] chapter 5, par. 23 ff. ("When we consider the facts carefully [...]")
And the interested user could search for "When we consider the facts carefully" and arrive to the desired location.