M. D. Banus and M. C. Lavine: J. appl. Phys. 40 (1969) 409.
K. Asaumi, O. Shimomura and S. Minomura: J. Phys. Soc. Japan.41 (1976) 1630.
S. Minomura, O. Shimomura, K. Asaumi, H. Oyanagi and K. Takemura: Proc. 7th. Conf. Amorphous and Liquid Semiconductors, Edinburgh, 1977, ed. W. E. Spear, p. 53.
T. Yagi, Y. Ida, Y. Sato and S. Akimoto: Phys. Earth Planet. Interiors 10 (1975) 348.
H. G. Drickamer, R. W. Lynch, R. L. Clendenen and E. A. Perez-Albuerne: ”X-ray diffraction studies of the lattice parameters of solids under very high pressure” in Solid State Physics (Academic Press, New York and London, 1966) Vol. 19, p. 139.