Ilona Heldal Anthony Steed Maria Spante Ralph Schroeder Sophia Bengtsson Marja Partanen Successes and Failures in Co-Present Situations. 563-579 2005 14 Presence 5 http://dx.doi.org/10.1162/105474605774918679 db/journals/presence/presence14.html#HeldalSSSBP05