Head First into Serious Health Gaming - a2e2 as a New Approach of Digital Exercise Coaching for Seniors. - Ute Ritterfeld; Peter H. M. P. Roelofsma; Priscilla Haring; Dimitrina Chakinska; Misha van den Bosch; Leo Versteeg (Int. J. Comput. Sci. Sport, 2010)

Preference for Combining or Separating Events in Human and Avatar Decisions. - Peter H. M. P. Roelofsma; Leo Versteeg (AmI Workshops, 2011)

Sex Differences in User Acceptance of Avatars. - Leo Versteeg; Peter H. M. P. Roelofsma (AmI Workshops, 2011)