This chapter is based in part on
Abramowitz and Stegun (1964, Chapter 21) by A. N. Lowan.
The main references used in writing this chapter are Arscott (1964b),
Erdélyi et al. (1955), Meixner and Schäfke (1954), and Meixner et al. (1980).
For additional bibliographic reading see Flammer (1957),
Komarov et al. (1976), and Stratton et al. (1956).