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5. NIST Digital Library of Mathematical Functions. Release 1.1.9 of 2023-03-15. Olver, F. W. J., Olde Daalhuis, A. B., Lozier, D. W., Schneider, B. I., Boisvert, R. F., Clark, C. W., Miller, B. R., Saunders, B. V., Cohl, H. S., McClain, M. A.: eds. https://dlmf.nist.gov/