1. Are runaway energy capital costs a constraint on development?;Williams,1988
2. Illuminations Engineering for Energy-Efficient Luminous Environments;Holms,1980
3. Private communication from North American Philips, and from Westerfield Corporation, March 1989.
4. Plano Nacional de Energia Elétrica 1987/2010 — Relatório Geral;Ministério das Minas e Energia, Centrais Eléctricas Brasileiras SA - Electrobrás,1987