How many papers did the authors of 'A Security Policy for an A1DBMS (a Trusted Subject)' publish in 1989?
Count the papers published by the authors of 'A Security Policy for an A1DBMS (a Trusted Subject)' in 1989.
SELECT DISTINCT (COUNT(?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/sp/Wilson89> <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#yearOfPublication> '1989' }
<https://dblp.org/rec/conf/sp/Wilson89>