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Gomez, Patric; Zimmermann, Philippe Georges; Guttormsen, Sissel; Danuser, Brigitta (2009). Valence lasts longer than arousal: Persistence of induced moods as assessed by psychophysiological measures. Journal of psychophysiology, 23(1), pp. 7-17. Göttingen: Hogrefe & Huber 10.1027/0269-8803.23.1.7
Schmitz, Felix Michael; Zimmermann, Philippe Georges; Guttormsen, Schär Sissel (2009). An initial e-learning ontology as didactic guide for teachers, developers and learners.
Schmitz, Felix Michael; Zimmermann, Philippe Georges; Guttormsen, Sissel (2009). An initial e-learning ontology: Formal description of four key concepts in the field of e-learning.
