1. Rassaerts, H., Nowotny, H., Vinek, G., Benesovsky, F.: Monatsh. Chem. 98 (1967) 460; C.A. 66 (1967) 119619m.
2. Nowotny, H., Auer-Welsbach, H.: Monatsh. Chem. 92 (1961) 789.
3. Taylor, A., Jones, R.M., in O’Connor, J.R., Smiltens, J. (eds.): “Silicon Carbide”, p. 147, Pergamon Press, New York, 1960.
4. Taylor, A., Laidler, D.S.: Brit. Appl. Phys. 1 (1950) 174.
5. Becker, K.: Naturwissenschaften 14 (1926) 1036.