1. A recurrence formula equivalent to (75) is given, without proof, in Jahnke EmdeFunktionentafeln, 3rd ed. 139 139 while in the 2nd and 3rd editions, some earlyzrare given with decimal coefficients. Airey (Phil. Mag. xxxii. pp. 7–16, 1916) gives equivalent values. End figures are in both instances unreliable.