@article {Bird1986,
	title = {Simple Solar Spectral Model for Direct and Diffuse Irradiance on Horizontal and Tilted Planes at the Earth{\textquoteright}s Surface for Cloudless Atmospheres},
	journal = {Journal of Climate and Applied Meteorology},
	volume = {25},
	year = {1986},
	month = {Jan-01-1986},
	pages = {87 - 97},
	issn = {0733-3021},
	doi = {10.1175/1520-0450(1986)025<0087:SSSMFD>2.0.CO;2},
	url = {http://journals.ametsoc.org/doi/abs/10.1175/1520-0450\%281986\%29025\%3C0087\%3ASSSMFD\%3E2.0.CO\%3B2},
	author = {Bird, Richard E. and Riordan, Carol}
}
