Mention the co-authors of A. Gisbrecht.
With which other authors has the author Andrej Gisbrecht written papers?
SELECT DISTINCT ?answer WHERE { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/80/8426> . ?x <https://dblp.org/rdf/schema#authoredBy> ?answer FILTER(?answer != <https://dblp.org/pid/80/8426>) }
<https://dblp.org/pid/80/8426>