Adam Cheyer Luc Julia Jean-Claude Martin A Unified Framework for Constructing Multimodal Experiments and Applications. 234-242 1998 conf/cmc/1998 Cooperative Multimodal Communication http://link.springer.de/link/service/series/0558/bibs/2155/21550234.htm db/conf/cmc/cmc1998.html#CheyerJM98