1. J. D. Beck, R. Conrad, Sol.-St. Com.13, 93 (1973)
2. A.J.R. De Kock, Philips Res. Reports Supplement 1 (1973)
3. T. Abe, Y. Abe, J. I. Chikawa, Semicond. Silicon, Ed. H.R. Huff, R.R. Burgess, 95 (1973)
4. K. Graff, H. Pieper, G. Goldbach, Semicond. Silicon, Ed. H.R. Huff, R.R. Burgess, 170 (1973)
5. 1973 Annual Book of ASTM Standards F 28-66