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@article{MAN_1912__72_158572, author = {G.D. Birkhoff}, title = {Note on the {Expansion} of the {Green's} {Function.}}, journal = {Mathematische Annalen}, pages = {292--294}, publisher = {mathdoc}, volume = {72}, year = {1912}, zbl = {43.0400.02}, url = {http://geodesic.mathdoc.fr/item/MAN_1912__72_158572/} }
G.D. Birkhoff. Note on the Expansion of the Green's Function.. Mathematische Annalen, Tome 72 (1912), pp. 292-294. http://geodesic.mathdoc.fr/item/MAN_1912__72_158572/