@article{701130,
title = {$\Delta $ -closed graph theorem},
booktitle = {Abstracta. 6th Winter School on Abstract Analysis},
series = {GDML\_Books},
publisher = {Czechoslovak Academy of Sciences},
address = {Praha},
year = {1978},
pages = {87-90},
url = {http://dml.mathdoc.fr/item/701130}
}
Wilhelm, M. $\Delta $ -closed graph theorem, dans Abstracta. 6th Winter School on Abstract Analysis, GDML_Books, (1978), pp. 87-90. http://gdmltest.u-ga.fr/item/701130/