1. paper given at the 10th meeting of the Section of Crystallography of the German Mineralogical Society;Kaldis,1968
2. paper given at the 1st meeting of the Section for Crystal Growth of the Swiss Crystallographic Society;Busch,1969
3. E. Kaldis and R. Verreault, to be published in J. Less-Common Metals.
4. G. Busch, E. Kaldis, P. Streit and P. Wachter, to be published.
5. The crystal structure of β dicalcium silicate