The TAC paradigm: unified conceptual framework to represent Tangible User Interfaces. - Eduardo H. Calvillo Gámez; Nancy Leland; Orit Shaer; Robert J. K. Jacob (CLIHC, 2003)

The TAC paradigm: specifying tangible user interfaces. - Orit Shaer; Nancy Leland; Eduardo H. Calvillo Gámez; Robert J. K. Jacob (Pers. Ubiquitous Comput., 2004)