Messina, Ricardo, Weiliang Jin, and Alejandro W. Rodriguez. 2016. “Exact Formulas for Radiative Heat Transfer Between Planar Bodies under Arbitrary Temperature Profiles: Modified Asymptotics and Sign-Flip Transitions”. PRB 94: 205438. Referenced from journals.aps.org: Exact formulas for radiative heat transfer between planar bodies under arbitrary temperature profiles: modified asymptotics and sign-flip transitions.