Mieke Massink Diego Latella Maurice H. ter Beek Michael D. Harrison Michele Loreti A Fluid Flow Approach to Usability Analysis of Multi-user Systems. 166-180 2008 TAMODIA/HCSE http://dx.doi.org/10.1007/978-3-540-85992-5_15 conf/tamodia/2008 db/conf/tamodia/tamodia2008.html#MassinkLBHL08