1. Reduction of the Equations of Radiative Transfer for a Plane-parallel Planetary Atmosphere: Part I, The RAND Corporation, Memorandum RM-4951-PR;Sekera,1966
2. Reduction of the Equations of Radiative Transfer for a Plane-parallel Planetary Atmosphere: Part II, The RAND Corporation, Memorandum RM-5056-PR;Sekera,1966
3. A Complete Solution of the X-and Y-Equations of Chandrasekhar.
4. Chandrasekhar's X and Y Functions for Homogeneous Atmospheres, The RAND Corporation, Memorandum RM-3376-JPL;Mullikin,1962
5. Multiple Scattering in Homogeneous Plane-parallel Atmospheres, The RAND Corporation, Memorandum RM-4846-PR;Mullikin,1965