@article{GDZPPN002060167,
title = {The Central Connection Problem at Turning Points of Linear Differential Equations},
journal = {Commentarii mathematici Helvetici},
volume = {46},
year = {1971},
pages = {65-86},
zbl = {0211.11001},
url = {http://dml.mathdoc.fr/item/GDZPPN002060167}
}
Wasow, Wolfgang. The Central Connection Problem at Turning Points of Linear Differential Equations. Commentarii mathematici Helvetici, Tome 46 (1971) pp. 65-86. http://gdmltest.u-ga.fr/item/GDZPPN002060167/