Isabel Wanderley,  Judith Kelner,  Nacha Costa,  Verônica Teichrieb. 

This paper surveys types of user interaction in Mixed Reality systems. Describes the basics concepts of this kind of applications and classifies some interfaces based in the type of augmentation that provides to users, namely interaction, action and perception augmentation.

http://www.lbd.dcc.ufmg.br/colecoes/svr/2006/055.pdf

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