No
> or refer to your work (or any other previous work)?
I presume they simply didn't know about it. I emailed the authors.
> Do people use it?
Yes
https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n19...
"Programming languages such as Eiffel and D have a Contracts facility; this paper proposes a Contracts facility for C++."
The tiny subset of D userbase, which is tiny in its own.