@article{GDZPPN002179806,
title = {Asymptotic Expansions of Mathieu Functions and their Characteristic Numbers.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {211},
year = {1962},
pages = {11-32},
zbl = {0129.05601},
url = {http://dml.mathdoc.fr/item/GDZPPN002179806}
}
Dingle, R.B.; Müller, H.J.W. Asymptotic Expansions of Mathieu Functions and their Characteristic Numbers.. Journal für die reine und angewandte Mathematik, Tome 211 (1962) pp. 11-32. http://gdmltest.u-ga.fr/item/GDZPPN002179806/