@article{1077466681,
author = {Langer, Rudolph E.},
title = {The solutions of a class of ordinary linear differential
equations of the third order in a region containing a multiple
turning point},
journal = {Duke Math. J.},
volume = {23},
number = {1},
year = {1956},
pages = { 93-110},
language = {en},
url = {http://dml.mathdoc.fr/item/1077466681}
}
Langer, Rudolph E. The solutions of a class of ordinary linear differential
equations of the third order in a region containing a multiple
turning point. Duke Math. J., Tome 23 (1956) no. 1, pp. 93-110. http://gdmltest.u-ga.fr/item/1077466681/