C. B. Caparroso-Pérez, D. V. Marín-Muñoz, and A. Echavarría-Velásquez, “Marginal adaptation and internal fit of zirconia-ytrya frameworks fabricated with Procera® and Cerec in-lab® cad/cam systems”, Rev Fac Odontol Univ Antioq, vol. 22, no. 2, pp. 186–197, Jul. 2011.