Tsinghua University published a paper on Assembly line in what year?
When was the paper on Assembly line by Tsinghua University, Department of Automation, TNList, Beijing, China published?
SELECT DISTINCT ?answer WHERE { <https://dblp.org/rec/journals/candie/SunWP20> <https://dblp.org/rdf/schema#authoredBy> ?x . ?x <https://dblp.org/rdf/schema#primaryAffiliation> 'Tsinghua University, Department of Automation, TNList, Beijing, China' . <https://dblp.org/rec/journals/candie/SunWP20> <https://dblp.org/rdf/schema#yearOfPublication> ?answer }
<https://dblp.org/rec/journals/candie/SunWP20>