TY - JOUR AU - Johnson, B. Carol AU - Litorja, Maritoni AU - Butler, James C2 - SPIE DA - 2003-01-01 00:01:00 LA - en M1 - 5151 PB - SPIE PY - 2003 TI - Preliminary Results of Aperture Area Comparison for Exo-Atmospheric Solar Irradiance UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=104554 ER -