The main references used in writing this chapter are Olver (1997b) and
Wong (1989).
For additional bibliographic reading see
Bender (1974),
Bleistein and Handelsman (1975),
Copson (1965),
de Bruijn (1961),
Dingle (1973),
Erdélyi (1956),
Jones (1972, 1997),
Lauwerier (1974),
Odlyzko (1995),
Paris and Kaminski (2001),
Slavyanov and Lay (2000),
Temme (1995c), and
Wasow (1965).