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@article{MAN_1962__145_160915, author = {J.J. Sch\"affer}, title = {Linear {Differential} {Equations} and {Functional} {Analysis.} {VI.}}, journal = {Mathematische Annalen}, pages = {354--400}, publisher = {mathdoc}, volume = {145}, year = {1962}, zbl = {0099.32501}, url = {http://geodesic.mathdoc.fr/item/MAN_1962__145_160915/} }
J.J. Schäffer. Linear Differential Equations and Functional Analysis. VI.. Mathematische Annalen, Tome 145 (1962), pp. 354-400. http://geodesic.mathdoc.fr/item/MAN_1962__145_160915/