1. Evaluation of the technical properties of porcelain tile and granite;Menegazzo;Proc. Qualicer,2002
2. Porcelain stoneware tile surfaces;Esposito;Am. Ceram. Soc. Bull.,2000
3. 26a ISN, 2005. Assopiastrelle, 2006, http://www.assopiastrelle.it.
4. Comportamiento del gres porcelanico durante la operacion de pulido;Orts;Bol. Soc. Esp. Ceram. Vidrio,2001
5. Stain resistance of porcelain stoneware tiles;Esposito;Am. Ceram. Soc. Bull.,2002