What is the average number of research papers published by the author Rolf N. per year?
Report the average number of publications by Rolf N. per year.
SELECT (AVG(?count) AS ?answer) { SELECT (COUNT(?y) AS ?count) WHERE { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/n/RolfNiedermeier> . ?x <https://dblp.org/rdf/schema#yearOfPublication> ?y } GROUP BY ?y }
<https://dblp.org/pid/n/RolfNiedermeier>