Searching for references to a certain URI

What strategies do you use to find all references to a certain URI, e.g. http://d-nb.info/gnd/120273152, on the (semantic) web?

I used Sindice for this, but sadly the service is discontinued, and the data becomes more and more outdated. Google link:/info: prefixes don't work, because highly relevant links on web pages (e.g. from https://en.wikipedia.org/wiki/Horst_Siebert) are excluded by rel=nofollow links, and pure RDF links (e.g. from dbpedia) don't show up at all.

Cheers, Joachim