Sentence Level Subjectivity and Sentiment Analysis Experiments in NTCIR-7 MOAT Challenge. - Lizhen Qu; Cigdem Toprak; Niklas Jakob; Iryna Gurevych (NTCIR, 2008)

Educational Question Answering based on Social Media Content. - Iryna Gurevych; Delphine Bernhard; Kateryna Ignatova; Cigdem Toprak (AIED, 2009)

Sentence and Expression Level Annotation of Opinions in User-Generated Discourse. - Cigdem Toprak; Niklas Jakob; Iryna Gurevych (ACL, 2010)

System: Machine Learning. - Cigdem Toprak (IATEL - Interdisciplinary Approaches to Technology-enhanced Learning, 2011)

System: maschinelles Lernen. - Cigdem Toprak (IATEL - Interdisciplinary Approaches to Technology-enhanced Learning, 2011)