Wasn't the paper 'CHIC: a combination-based recommendation system' published by the author Samuel Madden in SIGMOD Conference?
Was the paper 'CHIC: a combination-based recommendation system' not published by Samuel Madden in SIGMOD Conference?
ASK { <https://dblp.org/rec/conf/sigmod/VartakM13> <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/m/SamuelMadden> . <https://dblp.org/rec/conf/sigmod/VartakM13> <https://dblp.org/rdf/schema#publishedIn> 'SIGMOD Conference' FILTER NOT EXISTS { <https://dblp.org/rec/conf/sigmod/VartakM13> <https://dblp.org/rdf/schema#authoredBy> <https://dblp.org/pid/m/SamuelMadden> . <https://dblp.org/rec/conf/sigmod/VartakM13> <https://dblp.org/rdf/schema#publishedIn> 'SIGMOD Conference' } }
<https://dblp.org/pid/m/SamuelMadden> <https://dblp.org/rec/conf/sigmod/VartakM13>