el trabajo que bajo el título "Efecto de la composición en las propiedades de los vidrios del sistema Ca-M-Si-Al-O-N-F (M=Y/Er/Nd/Mg)" presenta en esta memoria, y que constituye su Tesis para optar al grado de Doctor en Ingeniería Química.Y para que conste a los efectos oportunos, firman el presente certificado en
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