%0 Journal Article %A G.D. Birkhoff %T Equivalent Singular Points of Ordinary Linear Differential Equations %J Mathematische Annalen %D 1913 %P 134-139 %V 74 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1913__74_158624/ %F MAN_1913__74_158624