pdf dblp UWaterlooMDS at the TREC 2019 Decision Track Mustafa Abualsaud | Fuat C. Beylunioglu | Mark D. Smucker | P. Robert Duimering Proceedings of the Twenty-Eighth Text REtrieval Conference, TREC 2019, Gaithersburg, Maryland, USA, November 13-15, 2019