for the first one, o lukin e ni: http://portal.acm.org/citation.cfm?id=1520620 it is the conference abstract, i guess the second one is looking like a book chapter: T. Gross et al. (Eds.): INTERACT 2009, Part II, LNCS 5727, pp. 848–851, 2009. but if you are in doubt, just contact Omar Mubin, as he i...