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R. D. James "On the expansion coefficients of the functions ${u \mathord{\left/ {\vphantom {u {{\text{sn}}u}}} \right. \kern-\nulldelimiterspace} {{\text{sn}}u}}$ and ${{u^2 } \mathord{\left/ {\vphantom {{u^2 } {{\text{sn}}^2 u}}} \right. \kern-\nulldelimiterspace} {{\text{sn}}^2 u}}$," Bulletin of the American Mathematical Society, Bull. Amer. Math. Soc. 40(8), 632-640, (August 1934)