What are the papers written by Zhihua Hao and Xiaojiang Ma together?
Find the papers written by Hao, Zhihua and Xiaojiang Ma together.
SELECT DISTINCT ?answer WHERE { ?answer <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/46/5604> . ?answer <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/47/4871> }
<https://dblp.org/pid/46/5604> <https://dblp.org/pid/47/4871>