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Sponsored by the United States Army under Contract No. DAAG29-80-C-0041. This work was partially supported by the National Science Foundation under Grant No. MCS-8101568.
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Askey, R. An integral of products of Legendre functions and a Clebsch-Gordan sum. Lett Math Phys 6, 299–302 (1982). https://doi.org/10.1007/BF00400326
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DOI: https://doi.org/10.1007/BF00400326