Albrecht Schmidt Kofi Asante Aidoo Antti Takaluoma Urpo Tuomela Kristof Van Laerhoven Walter Van de Velde Advanced Interaction in Context. 89-101 http://link.springer.de/link/service/series/0558/bibs/1707/17070089.htm 1999 conf/huc/1999 HUC db/conf/huc/huc1999.html#SchmidtATTLV99