Answers are grounded in this paper and cite their sources.
W. N. BAILEY; ON THE PRODUCT OF TWO ASSOCIATED LEGENDRE FUNCTIONS, The Quarterly Journal of Mathematics, Volume os-11, Issue 1, 1 January 1940, Pages 30–35, htt
No takes yet. Share an insight, caveat, or question.
W. N. Bailey (1940) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: