Which papers did author Gerard J. M. Janssen publish and in which year?
Mention the papers published by Gerard J. M. Janssen and in which year.
SELECT DISTINCT ?firstanswer ?secondanswer WHERE { ?firstanswer <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/49/4927> . ?firstanswer <https://dblp.org/rdf/schema#yearOfPublication> ?secondanswer }
<https://dblp.org/pid/49/4927>