Encyclopedia
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Associated Legendre functions – Table of integrals, series, and products
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Gradshteyn, I. S., & Ryzhik, I. M. (2014). Associated Legendre functions (pp. 776–785). In A. Jeffrey & D. Zwillinger (Eds.), Table of integrals, series, and products (8th ed.). Academic Press.
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Astronomical spectroscopy: An introduction to the atomic and molecular physics of astronomical spectra
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Tennyson, J. (2005). Astronomical spectroscopy: An introduction to the atomic and molecular physics of astronomical spectra. London, England: Imperial College Press.
