@article{03889961,
title = {On the asymptotic series solution of some higher order linear differential equations at turning points.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {7},
year = {1984},
pages = {541-548},
doi = {10.1155/S0161171284000600},
zbl = {0558.34050},
language = {en},
url = {http://dml.mathdoc.fr/item/03889961}
}
Gorman, Arthur D. On the asymptotic series solution of some higher order linear differential equations at turning points.. International Journal of Mathematics and Mathematical Sciences, Tome 7 (1984) pp. 541-548. doi : 10.1155/S0161171284000600. http://gdmltest.u-ga.fr/item/03889961/