1 R.N. Thomas, Some Aspects of Non-Equilibrium Thermodynamics in the Presence of a Radiation Field, First (University of Colorado Press, 1965).
1 R.N. Thomas, Bulletin Assoc. Pour Le Developpement International De l"Observatoire De Nice 1, (1964).
1 C.W. Pecker, and R.N. Thomas, Journal of Quantitative Spectroscopy and Radiative Transfer 3, (1963).