@conference {2027, title = {ntegrating hands-free interface into 3d virtual reality environments}, booktitle = {ARO Non-Manual Control Devices Symposium}, year = {2009}, pages = {{\textendash}}, author = {A. Tognetti and Gulrez, T and N. Carbonaro and G. Dalle Mura and G. Zupone and D. De Rossi} }