Professor Hanke is on Twitter. He has his five Wikipedia articles and his info on Wikidata is well developed. With a scholar of his eminence, you would expect a lot of known publications as well. However, never mind the 153 English Wikipedia references, never mind the links to 13 external authorities, finding his work is not easy nor obvious.
The problem with Wikipedia references, it is a hodgepodge of links about him and links to his works. His VIAF registration may bring you some of his works but it will not tell you where his books are cited. Mr Hanke does not have an ORCID identifier and consequently it is not easy to include his data on Wikidata.
This is not about Mr Hanke; in certain fields of science people do not have an ORCID identifier or are not open about their publications. When you are interested in a specific subject or a specific scientist, it helps when the information is FAIR.
So what is missing; there is this database with all Wikipedia references, it needs to be included in Wikidata as soon as possible. It may require a fair deal of social manoeuvring to include all Wikipedia references to Wikidata. But the benefits; the benefits will be huge. Given that Wikipedia references are backed up by the Internet Archive, this will extend for these links in Wikidata as well. It makes them FINDABLE and ACCESSIBLE. At Wikidata, this data becomes INTEROPERABLE and REUSABLE (FAIR).
So my 2019 wish for the Wikimedia Foundation is to become FAIR in what it says and what it does.