Was a paper not not co-authored by Raitio, T. and Paavo Alku?
Didn't Raitio, T. and Paavo A. not co-author a paper?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/19/8809> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/99/2726> }
<https://dblp.org/pid/19/8809> <https://dblp.org/pid/99/2726>