References
- Bragg , W. L. 1937 . Atomic structure of minerals , Cornell Univ. Press .
- v. Eckermann , H. 1938 . The Anorthosite and Kenningite of the Nordingrå-Rödö region , G. F. F. .
- Niggli , P. 1937 . Das Magma Leipzig
- Wickman , Frans E. 1943 . Some aspects of the geochemistry of igneous rocks and of differentiation by crystallization , G. F. F. .