1. See “Direct Use and Retail Sales of Electricity to Ultimate Customers by Sector”, http://www.eia.doe.gov/cneaf/electricity/epa/epat7p2.html, Residential Energy Consumption in 2001, DOE, Energy Information Administration, Washington, DC, ftp://ftp.eia.doe.gov/pub/consumption/residential/2001hc_tables/spaceheat_household2001.pdf.
2. C.D. Engebretson, The Use of Solar Energy for Space Heating-M.I.T. Solar House IV, in: Proceedings of the UN Conference on New Sources of Energy, vol. 5, 1964, 1959.
3. Residential heating with solar heated air—The Colorado Solar House;Löf;ASHRAE Transactions,1963
4. Passive solar research and practice;Balcomb;Energy and Buildings,1984
5. SERI, Passive Solar Performance Summary of 1982–1983 Class B Results, SERI/SP-271-2362, Golden, CO, 1984.