1. Eigenvalues for the Wilkins Equation
2. R. COURANT and D. HILBERT, “Methods of Mathematical Physics,” Vol. I, p. 344. Interscience, New York, 1953.
3. The Thermal Neutron Spectrum in a Diffusing Medium
4. Thermal Neutron Flux Distributions in Space and Energy
5. H. BATEMAN, “Higher Transcendental Functions,” Vol. II, compiled by the staff of the Bateman Manuscript Project, A. Erdelyi, Director. McGraw-Hill, New York, 1953.