Was a paper not not co-authored by M\u00E1rio S\u00E9rgio Teixeira and Gon\u00E7alves, R.?
Didn't M\u00E1rio S\u00E9rgio Teixeira and Ramiro Gon\u00E7alves not co-author a paper?
ASK { ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/146/6451> . ?x <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/18/5476> }
<https://dblp.org/pid/146/6451> <https://dblp.org/pid/18/5476>