Mention the count of papers published by the authors of 'First Passage Problems for Nonstationary Discrete-Time Stochastic Control Systems' in Eur. J. Control.
How many papers did the authors of 'First Passage Problems for Nonstationary Discrete-Time Stochastic Control Systems' publish in Eur. J. Control?
SELECT DISTINCT (COUNT(?answer) AS ?count) WHERE { <https://dblp.org/rec/journals/ejcon/GuoHH12> <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#publishedIn> 'Eur. J. Control' }
<https://dblp.org/rec/journals/ejcon/GuoHH12>