1. M. Abramowitz and I. Stegun (eds.), Handbook of Mathematical Functions, National Bureau of Standards, 1964.
2. R. Bellman, R. Kalaba and M. Prestrud, Invariant Imbedding and Radiative Transfer in Slabs of Finite Thickness, American Elsevier Publishing Co., New York, 1963.
3. R. Bellman, H. Kagiwada, R. Kalaba and M. C. Prestrud, Invariant Imbedding and Time-Dependent Transport Processes, American Elsevier Publishing Co., New York, 1964.
4. H. Kagiwada, R. Kalaba and S. Ueno, Multiple Scattering Processes: Inverse and Direct, Addison-Wesley Publishing Co., Reading, Mass., 1975.
5. B. Carnahan, H. Luther and J. Wilkes, Applied Numerical Methods, Wiley, New York, 1969.