Tolga K. Çapin Selim Balcisoy Daniel Thalmann Nadia Magnenat-Thalmann Tat-Seng Chua 463 2008 24 The Visual Computer 7-9 http://dx.doi.org/10.1007/s00371-008-0253-9 db/journals/vc/vc24.html#capinBTMC08