Was a paper not not co-authored by Shinichi Takagi and Mitsuru T.?
Didn't S. Takagi and Mitsuru T. not co-author a paper?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/89/3434> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/44/4263> }
<https://dblp.org/pid/89/3434> <https://dblp.org/pid/44/4263>