The renders something like:
ref argument of \x marks the link as reference, e.g.:Trump said this and that.\x[donald-trump-access-hollywood-tape]{ref}
= Donald Trump Access Hollywood tapeTrump said this and that.<a href="donald-trump-access-hollywood-tape">*</a>This could currently be replicated without but later on we might add more precise reference fields like the page of a book or date fetched as Wikipedia supports.
ref by just using:Trump said this and that.\x[donald-trump-access-hollywood-tape][*]Implemented at: github.com/ourbigbook/ourbigbook/issues/137