@article{GDZPPN002265222,
title = {Equivalent Singular Points of Ordinary Linear Differential Equations},
journal = {Mathematische Annalen},
volume = {74},
year = {1913},
pages = {134-139},
zbl = {44.0373.01},
url = {http://dml.mathdoc.fr/item/GDZPPN002265222}
}
Birkhoff, G.D. Equivalent Singular Points of Ordinary Linear Differential Equations. Mathematische Annalen, Tome 74 (1913) pp. 134-139. http://gdmltest.u-ga.fr/item/GDZPPN002265222/