@article{Ursell:1980:ILP,
author = {Ursell, F.},
title = {Integrals with a large parameter: A double complex integral
with four nearly coincident saddle-points},
journal = {Math. Proc. Cambridge Philos. Soc.},
fjournal = {Mathematical Proceedings of the Cambridge Philosophical
Society},
volume = {87},
year = {1980},
number = {2},
pages = {249–273},
issn = {0305-0041},
coden = {MPCPCO},
mrclass = {41A60 (30E15)},
mrnumber = {MR0553582 (81j:41050)},
mrreviewer = {F. I. Ibragimov},
doi = {10.1017/S0305004100056711},
zblno = {0436.32004}}