<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold" style="font-size:12pt">Ravi, Kumar / Ravi, Vadlamani</hi><hi xmlns="http://www.tei-c.org/ns/1.0" style="font-size:12pt" xml:space="preserve"> (2015): "A survey on opinion mining and sentiment analysis: Tasks, approaches and applications", in: </hi><hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic" style="font-size:12pt">Knowledge-Based Systems</hi><hi xmlns="http://www.tei-c.org/ns/1.0" style="font-size:12pt" xml:space="preserve"> 89: 14–46.</hi>