Count the number of papers that Andries van Dam has published in IEEE Ann. Hist. Comput..
How many papers has Andries v. Dam published in IEEE Ann. Hist. Comput.?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { ?answer <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/d/AvDam> . ?answer <https://dblp.org/rdf/schema#publishedIn> 'IEEE Ann. Hist. Comput.' }
<https://dblp.org/pid/d/AvDam>