1. W.R. McKee, K.R. Carson, J.D. Levine, in: Proceedings of the 16th IEEE PVSC, San Diego, 1982, 257pp.
2. J. Levine, G. Hotchkiss, M. Hammerbacher, in: Proceedings of the 22nd IEEE PVSC, Las Vegas, 1991, 1045pp.
3. R. Schmit, W. Van Cak, E. Graf, in: Proceedings of the 12th European PVSEC, Amsterdam, 1994, 737pp.
4. Crystal Structure Analysis of Spherical Silicon Using X-Ray Pole Figures
5. Fabrication of Spherical Silicon Solar Cells with Semi-Light-Concentration System