In 2013, how many papers did the authors of 'On the rainbow vertex-connection' publish?
How many papers did the authors of 'On the rainbow vertex-connection' publish in 2013?
SELECT DISTINCT (COUNT(?answer) AS ?count) WHERE { <https://dblp.org/rec/journals/dmgt/LiS13> <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#yearOfPublication> '2013' }
<https://dblp.org/rec/journals/dmgt/LiS13>