@article{Langer:1934:ME,
author = {Langer, Rudolph E.},
title = {The solutions of the {M}athieu equation with a complex
variable and at least one parameter large},
journal = {Trans. Amer. Math. Soc.},
fjournal = {Transactions of the American Mathematical Society},
volume = {36},
year = {1934},
number = {3},
pages = {637–695},
issn = {0002-9947},
coden = {TAMTAM},
mrclass = {34M30 (34A25 34E05)},
mrnumber = {MR1501760},
links = {\URL[FullText]{http://links.jstor.org/sici?sici=0002-9947%28193407%2936%3A3%3C637%3ATSOTME%3E2.0.CO%3B2-K}},
zblno = {0010.02104}}