TY - JOUR AU - Johnson, Bettye AU - Litorja, Maritoni AU - Joel, AU - Shirley, Eric AU - Butler, James AU - Barnes, Robert C2 - Applied Optics DA - 2013-11-13 LA - en PB - Applied Optics PY - 2013 TI - Results of aperture area comparisons for exo-atmospheric total solar irradiance measurements ER -