Designing an Expressive Head for a Help Requesting Socially Assistive Robot. - Tim van der Grinten; Steffen Müller 001; Martin Westhoven; Sascha Wischniewski; Andrea Scheidig; Horst-Michael Gross (HFR, 2019)

Perceptions of a Help-Requesting Robot - Effects of Eye-Expressions, Colored Lights and Politeness of Speech. - Martin Westhoven; Tim van der Grinten; Steffen Müller 001 (MuC, 2019)

Communicating Robotic Help Requests. - Martin Westhoven; Tim van der Grinten (i-com, 2020)