1. 4) P. BOILLOT, R. BOULIN, and E. JAUDON: Chim. Anal.(Paris), 47 (1965), p.120
2. 7) A. GERHARDT, Th. KRAUS, and M. G. FROHBERG: Developement of a Method for the Rapid Determination of the Nitrogen Content of Steel Based on the Vacuun Fusion Method, with Special Consideration of the Metallugical Processes Involved in the De-gassing of Carbon-Saturated Iron Melts, (1966), p.62 [Balzers]
3. 8) M. DECROP: Fonderie, 228 (1965), p.57
4. 9) H. GROSSMANN: Giessereitechnik, 6 (1960), p.370
5. 10) R. SUÁREZ-ACOSTA: Minutes on third Balzers Conference, (1967), p.40