R2D2: A Dbpedia Chatbot Using Triple-Pattern Like Queries. - Haridimos Kondylakis; Dimitrios Tsirigotakis; Giorgos Fragkiadakis; Emmanouela Panteri; Alexandros Papadakis; Alexandros Fragkakis; Eleytherios Tzagkarakis; Ioannis Rallis; Zacharias Saridakis; Apostolos Trampas; Giorgos Pirounakis; Nikolaos Papadakis (Algorithms, 2020)