Short-range optical interaction between smartphones and public displays. - Morin Ostkamp; Sven Heitmann; Christian Kray (PerDis, 2015)

Pedestrian navigation and GPS deteriorations: user behavior and adaptation strategies. - Champika Ranasinghe; Sven Heitmann; Albert Hamzin; Max Pfeiffer; Christian Kray (OZCHI, 2018)

Evaluating User Experience under Location Quality Variations: A Framework for in-the-wild Studies. - Champika Ranasinghe; Max Pfeiffer; Sven Heitmann; Christian Kray (MobileHCI, 2019)

'Informed' consent in popular location based services and digital sovereignty. - Jerome Dreyer; Sven Heitmann; Felix Erdmann; Gernot Bauer; Christian Kray (J. Locat. Based Serv., 2022)

Linking location privacy, digital sovereignty and location-based services: a meta review. - Simge Özdal-Oktay; Sven Heitmann; Christian Kray (J. Locat. Based Serv., 2024)

Approximate vs. precise location in popular location-based services. - Sven Heitmann; Alexia Pagotto; Christian Kray (J. Locat. Based Serv., 2025)