1. 9. Conf. Rec. 9th Photovoltaic Specialist Conf., Silver Springs, May 1972.
2. and , 10. Conf. Rec. 10th Photovoltaic Specialist Conf., Alto, Nov. 1973.
3. , and , Semiconductor Silicon, Ed. and , Electrochem. Soc. Princeton N. J. 1973 (p. 170).
4. , and , Int. Conf. Evaluation of Space Environments on Materials, Toulouse, June 1974.
5. 1972 Annual Book of American Soc. for Testing and Materials, Philadelphia Pa., Standards F 28.