1. A. Roth, Vacuum Sealing Techniques, Pergamon Press, Oxford, p. 197 (1966).
2. W.H. Kohl, Handbook of Materials and Techniques for Vacuum Devices, Reinhold Publishing Co., New York, Chapter 15 (1967).
3. H.J. de Bruin, Method of Bonding Beryllium Oxide to Graphite, U.S. Patent 3300852, February 1964.
4. A.G. Buyers, Ceramic-Metal Seal, U.S. Patent 3254403, November 1964.
5. N.V. Philips, Procédé permettant d’assembler hermétiquement un objet métallique et des matériaux céramiques, Gloeilampen-fabricken, French Patent 1545493, November 1966.