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@article{MAN_1963__151_161070, author = {J.J. Sch\"affer}, title = {Linear {Differential} {Equations} and {Functional} {Analysis,} {VIII.}}, journal = {Mathematische Annalen}, pages = {57--100}, publisher = {mathdoc}, volume = {151}, year = {1963}, zbl = {0115.10804}, url = {http://geodesic.mathdoc.fr/item/MAN_1963__151_161070/} }
J.J. Schäffer. Linear Differential Equations and Functional Analysis, VIII.. Mathematische Annalen, Tome 151 (1963), pp. 57-100. http://geodesic.mathdoc.fr/item/MAN_1963__151_161070/