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 is a corresponding author