1. Minerals of the Viridine hornfels from Darmstadt, Germany;Abraham;Contrib. Mineral. Petrol.,1975
2. Ahrens, L. H., , A. J., Erlank, , Hafnium, in Handbook of Geochemistry, vol. II/5, sections B-O, Springer-Verlag, New York, 1969,
3. The high temperature behavior of water and carbon dioxide in cordierite and beryl;Aines;Am. Mineral.,1984
4. The structure of topaz;Alston;Proc. R. Soc. London, Ser. A,1928
5. Structural variations in idocrase;Arem;Am. Mineral.,1969