Find the papers written by A. Ansper and Jan Willemson together.
Which papers did A. Ansper and Jan W. write together?
SELECT DISTINCT ?answer WHERE { ?answer <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/03/4088> . ?answer <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/22/101> }
<https://dblp.org/pid/03/4088> <https://dblp.org/pid/22/101>