Muench, Antonio, Emílio C. Zanatta, Rafael Y. Ballester, and Josete B. C. Meira. 2010. “Color Unit Differences (?E) of Acrylic Resins Related to Powder-to-Liquid Ratio, Sample Thickness and Trade Marks”. Brazilian Dental Science 7 (2). São José dos Campos, Brazil. https://doi.org/10.14295/bds.2004.v7i2.483.