A Framework for Comparing Interactive Route Planning Apps in Tourism. - Sergejs Pugacs; Sven Helmer; Markus Zanker (EnCHIReS@EICS, 2017)

Social Sensing for Improving the User Experience in Orienteering. - Fabio Persia; Sven Helmer; Sergejs Pugacs; Giovanni Pilato (ICSC, 2019)