What is the average number of research papers published by the author Dietmar Zaefferer per year?
Report the average number of publications by Zaefferer, D. per year.
SELECT (AVG(?count) AS ?answer) { SELECT (COUNT(?y) AS ?count) WHERE { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/176/9635> . ?x <https://dblp.org/rdf/schema#yearOfPublication> ?y } GROUP BY ?y }
<https://dblp.org/pid/176/9635>