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Translated from Steklo i Keramika, No. 10, pp. 29–31, October, 1982.
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Velev, D.S., Veleva, M. & Georgiev, L.D. New ways of producing foam glass in Bulgaria. Glass Ceram 39, 523–527 (1982). https://doi.org/10.1007/BF00704568
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DOI: https://doi.org/10.1007/BF00704568