1. J. C. Mark:The Spherical Harmonics Method, I (CRT-340), II (CRT-338).
2. B. Carlson:Neutron Diffusion-Spherical Harmonics Theory (MDDC-236).
3. M. C. Wang andE. Guth:Phys. Rev.,84, 1092 (1951).
4. E. Jahnke andF. Emde:Tables of Functions, 4th Ed., Ch. VII.
5. A similar comparison has been made byJ. C. Mark, l.c. (1).