1. REC Group: Technology glossary. http://www.recgroup.com/tech/glossary.
2. Thermodynamics of solar-grade-silicon refining
3. New processes for the production of solar-grade polycrystalline silicon: A review
4. Geerligs LJ, Wyers GP, Jensen R, Raaness O, Waemes AN, Santen S, Reinink A, Weirsma B: ‘Solar-grade silicon by a direct route based on carbothermic reduction of silica: requirements and production technology’, ECN report no. ECN-RX-02-042, ECN, Petten, The Netherlands, 2002.