Count the number of papers that Pangfeng Liu has published in VEE.
In International Conference on Virtual Execution Environments, how many papers has Pangfeng Liu published?
SELECT (COUNT(DISTINCT ?answer) AS ?count) WHERE { ?answer <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/07/5712> . ?answer <https://dblp.org/rdf/schema#publishedIn> 'VEE' }
<https://dblp.org/pid/07/5712>