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@article{MM2_1974__13_154258, author = {Vlastimil Pt\'ak}, title = {A {Theorem} of the {Closed} {Graph} {Type.}}, journal = {Manuscripta mathematica}, pages = {109--130}, publisher = {mathdoc}, volume = {13}, year = {1974}, zbl = {0286.46008}, url = {http://geodesic.mathdoc.fr/item/MM2_1974__13_154258/} }
Vlastimil Pták. A Theorem of the Closed Graph Type.. Manuscripta mathematica, Tome 13 (1974), pp. 109-130. http://geodesic.mathdoc.fr/item/MM2_1974__13_154258/