Ahrens and Beylkin have described rotationally invariant quadratures on the sphere in [Proc. R. Soc. A (2009) 465, 3103–3125](https://doi.org/10.1098/rspa.2009.0104).
Ahrens and Beylkin have described rotationally invariant quadratures on the sphere in Proc. R. Soc. A (2009) 465, 3103–3125.