Title from title screen (viewed on Mar. 24, 2008).
"September 2007."
"To be presented at the 22nd European Photovoltaic Solar Energy Conference (PVSEC) and Exhibition, Milan, Italy, September 3-7, 2007."
Mode of access: Internet from the National Renewable Energy Laboratory web site. Address as of 3/24/08: http://www.nrel.gov/docs/fy07osti/42058.pdf; current access available via PURL.