1. 1) B. Lux, M. Grojes, D. Sapey and W. Kurz: Park. Met., 5 (1968), 123;
2. B. Lux, M. Grojes, D. Sapey and W. Kurz: Park. Met., 5 (1968), 567;
3. B. Lux, M. Grojes, D. Sapey and W. Kurz: Park. Met., 5 (1968), 587;
4. B. Lux, M. Grojes, D. Sapey and W. Kurz: Park. Met., 6 (1969), 464.
5. 2) BCIRA Broadsheet No. 138: Principal Forms of Graphite in Cast Iron, BCIRA, Alvechurch, Birmingham, England, (1976).