1. G. Aminoff and G. Broomé, Z. Krist. 80 (1931) 355.
2. L. W. Strock and V. A. Brophy, Am. Min. 40 (1956) 94.
3. L. W. Strock, Acta Cryst. 10 (1957) 840.
4. L. W. Strock, V. A. Brophy, and T. E. Peters, Electrochem. Soc. Meeting (New York, April 1958).
5. L. W. Strock, Illuminating Engineering 55 (1960) 24.