Patrick G. T. Healey Nik Swoboda Ichiro Umata Yasuhiro Katagiri Graphical representation in graphical dialogue. 375-395 2002 57 Int. J. Hum.-Comput. Stud. 4 http://dx.doi.org/10.1006/ijhc.2002.1022 db/journals/ijmms/ijmms57.html#HealeySUK02