1. E. Inönü, presented at the Fourth Transport Theory Conference, Blacksburg, Va. (1975).
2. K. M. Case and P. F. Zweifel,Linear Transport Theory(Addison-Wesley, Reading, Mass., 1967).
3. Anisotropic Scattering Approximations in the Monoenergetic Boltzmann Equation
4. A theorem on anisotropic scattering