Dear all,
I am making my first steps with SPARQL and would appreciate some help
from those in the know (got some help already, but am still getting
stuck easily).
Specifically, I am trying to get an overview of statements that are or
could be sourced to items that are scientific papers.
What I got so far:
(1) Wikidata items that are instances of scientific article
(Q13442814) and have a PMID (P698) or PMCID (P932)
https://query.wikidata.org/#PREFIX%20wd%3A%20%3Chttp%3A%2F%2Fwww.wikidata.o…
(2) Wikidata items that are instances of scientific article
(Q13442814) but do not have a PMID (P698) or PMCID (P932)
https://query.wikidata.org/#PREFIX%20wd%3A%20%3Chttp%3A%2F%2Fwww.wikidata.o…
What I want now is a list of (ideally) statements (or - less ideally -
items with such statements) that have references of one of the types
given in (1) and (2).
Any pointers?
Thanks,
Daniel