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Villegas, M.A., Capel, F. & Fernández Navarro, J.M. Microhardness and toughness of Na2O-B2O3-SiO2 materials prepared by the sol-gel procedure. J Mater Sci Lett 7, 791–792 (1988). https://doi.org/10.1007/BF00722103
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DOI: https://doi.org/10.1007/BF00722103