1. Aldura A. J. Piwinskii, H. C. Heard and R. N. Schock, ?The Physics and Chemistry of Minerals and Rocks?, edited by R. G. J. Strens (John Wiley and Sons., London, New York, Sydney, Toronto, 1976).
2. G. R. Olhoeft, ibid.?.
3. G. V. Keller, ?Hand book of Physics Constants?, edited by S. P. Clarks, Jr. (Geological Society of America Inc., New York).
4. G. Vijayasree, P. S. Mukherjee and S. Bhattacherjee, Indian J. Phys. 50 (1976) 1052.
5. P. S. Mukherjee, S. Bhattacherjee, Indian Miner. 17 (1976) 49.