The uniform asymptotic approximations given in §14.15 for
and
for
are extended to domains in the complex plane in the following
references: §§14.15(i) and 14.15(ii),
Dunster (2003b); §14.15(iii),
Olver (1997b, Chapter 12); §14.15(iv),
Boyd and Dunster (1986). For an extension of §14.15(iv) to complex
argument and imaginary parameters, see Dunster (1990b).