Weaver, William L. and , ‎Richard N. Green. Simulation Study of a Geometric Shape Factor Technique for Estimating Earth-emitted Radiant Flux Densities from Wide-field-of-view Radiation Measurements. Washington, DC: National Aeronautics and Space Administration, 1980.

Weaver, William L. and , ‎Richard N. Green. Simulation Study of a Geometric Shape Factor Technique for Estimating Earth-emitted Radiant Flux Densities from Wide-field-of-view Radiation Measurements. Washington, DC: National Aeronautics and Space Administration, 1980.