Geodesic
Note on the addition theorem for Legendre functions
Matematičeskie zametki, Tome 7 (1970) no. 2, pp. 137-145.

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The addition theorem for Legendre functions of the first and second kinds is generalized to the case of arbitrary superscripts. 
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     author = {N. N. Beloozerov},
     title = {Note on the addition theorem for {Legendre} functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {137--145},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_2_a0/}
}
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N. N. Beloozerov. Note on the addition theorem for Legendre functions. Matematičeskie zametki, Tome 7 (1970) no. 2, pp. 137-145. http://geodesic.mathdoc.fr/item/MZM_1970_7_2_a0/