1. H. Jebsen-Marwedel, Glastechnische Fabrikationsfehler, Springer-Verlag, Berlin (1959).
2. Symposium on the melting of glass, Union Scientific Continental du Verre, Charleroi (1958).
3. F. V. Tooley, Handbook of glass manufacture, Ogden Publishing Company, New York (1961).
4. M. Cable, Eighth International Congress on Glass, 164–178, Society of Glass Technology, Sheffield (1969).
5. E. M. Levin, H. F. McMurdie and F. P. Hall, Phase diagrams for ceramists, The American Ceramic Society, Columbus (1956).