'Ein Satz \u00FCber Free-Choice-Petrinetze' was authored by which authors?
List the authors of the paper 'Ein Satz \u00FCber Free-Choice-Petrinetze'.
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/journals/eik/Dopp83a> <https://dblp.org/rdf/schema#authoredBy> ?answer }
<https://dblp.org/rec/journals/eik/Dopp83a>