24 References

Too many references used, but will try to remember to start recording books used from now on. Here is current list

1. Applied partial differential equation, by Haberman
2. Advanced Mathematical Methods for Scientists and Engineers, Bender and Orszag, Springer.
3. Boundary value problems in physics and engineering, Frank Chorlton, Van Norstrand, 1969
4. Class notes. Math 322. University Wisconsin, Madison. Fall 2016. By Professor Smith. Math dept.
5. Mathematical methods in the physical sciences. Mary Boas, second edition.
6. Mathematical methods in physics and engineering. Riley, Hobson, Bence. Second edition.
7. various pages Wikipedia.
8. Mathworld at Wolfram.
9. Fourier series and boundary value problems 8th edition. James Brown, Ruel Churchill.
10. good note on Sturm-Liouville http://ramanujan.math.trinity.edu/rdaileda/teach/s12/m3357/lectures/lecture_4_10_short.pdf