Count the papers published by the authors of 'Hierarchies of Infinite Structures Generated by Pushdown Automata and Recursion Schemes' in International Symposium on Mathematical Foundations of Computer Science.
Mention the count of papers published by the authors of 'Hierarchies of Infinite Structures Generated by Pushdown Automata and Recursion Schemes' in MFCS.
SELECT DISTINCT (COUNT(?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/mfcs/Ong07> <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#publishedIn> 'MFCS' }
<https://dblp.org/rec/conf/mfcs/Ong07>