G. WolfFachbereich Mathematik, University Duisburg-Essen, Essen, Germany.
This chapter is based in part on
Abramowitz and Stegun (1964, Chapter 20) by G. Blanch.
The main references used in writing this chapter are Arscott (1964b),
McLachlan (1947), Meixner and Schäfke (1954), and
Meixner et al. (1980). For §§28.29–28.30 the
main source is Magnus and Winkler (1966).