Repositorio Institucional de la Universidad de Oviedo

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20130421

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This research was funded by the ‘‘Fondo Social Europeo’’ from Spanish Ministry of Science and Innovation under project MAT2004-06804-C02-01, and by FICYT under the project IB09-080. The Asociación de Graniteiros de Galicia is thanked for providing the material used. We would like to thank Dr. David Benavente for his help in understanding the chemical processes.