Which author named Johnsen published the paper on Security assessments?
Name the author who published the paper on Security assessments and has the name Ole-Arnt.
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/conf/safecomp/WintherJG01> <https://dblp.org/rdf/schema#authoredBy> ?answer }
<https://dblp.org/rec/conf/safecomp/WintherJG01>