A multi-layered architecture for sketch-based interaction within virtual environments.

Oliver Bimber L. Miguel Encarnação André Stork A multi-layered architecture for sketch-based interaction within virtual environments. 851-867 2000 24 Computers & Graphics 6 http://dx.doi.org/10.1016/S0097-8493(00)00088-1 db/journals/cg/cg24.html#BimberES00