Interactive Play Objects: The Influence of Multimodal Output on Open-Ended Play. - Eva Hopma; Tilde Bekker; Janienke Sturm (INTETAIN, 2009)

Creating opportunities for play: the influence of multimodal feedback on open-ended play. - Tilde Bekker; Eva Hopma; Janienke Sturm (Int. J. Arts Technol., 2010)

Improving Product Quality and Reliability with Customer Experience Data. - Aarnout Brombacher; Eva Hopma; Ashwin Ittoo; Yuan Lu 002; Ilse Luyk; Laura Maruster; Joel Ribeiro; Ton Weijters; Hans Wortmann (Qual. Reliab. Eng. Int., 2012)