In 2016, how many papers did the authors of 'Water Environment Early Warning System in Tongzhou District' publish?
Count the papers published by the authors of 'Water Environment Early Warning System in Tongzhou District' in 2016.
SELECT DISTINCT (COUNT(?answer) AS ?count) WHERE { <https://dblp.org/rec/conf/grmse/ZhangLZD15> <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#authoredBy> ?x . ?answer <https://dblp.org/rdf/schema#yearOfPublication> '2016' }
<https://dblp.org/rec/conf/grmse/ZhangLZD15>