References
Legendre functions
- T. Limpanuparb and J. Milthorpe. “Associated Legendre Polynomials and Spherical Harmonics Computation for Chemistry Applications” In: Proceedings of the 40th Congress on Science and Technology of Thailand (Dec 2014) arXiv: 1410.1748 
- “Legendre and Related Functions” (Chapter 14) In: NIST Digital Library of Mathematical Functions 
- “Legendre polynomials” on Wikipedia and Wolfram Math World 
- “Associated Legendre polynomials” on Wikipedia and Wolfrm Math World 
Blog series
- Introduction to Associated Legendre Polynomials (Legendre.jl Series, Part I)
- Calculating Legendre Polynomials (Legendre.jl Series, Part II)
- Pre-normalizing Legendre Polynomials (Legendre.jl Series, Part III)
- Maintaining numerical accuracy in the Legendre recurrences (Legendre.jl Series, Part IV)
- Introducing Legendre.jl (Legendre.jl Series, Part V)
- Numerical Accuracy of the Spherical Harmonic Recurrence Coefficient (Legendre.jl Series Addendum)