no. 2
Barreledness of subspaces of countable codimension and the closed graph theorem
Compositio Mathematica, Tome 24 (1972) no. 2, pp. 227-234. 
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     author = {Van Dulst, D.},
     title = {Barreledness of subspaces of countable codimension and the closed graph theorem},
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     pages = {227--234},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {24},
     number = {2},
     year = {1972},
     mrnumber = {320683},
     zbl = {0231.46009},
     language = {en},
     url = {http://www.numdam.org/item/CM_1972__24_2_227_0/}
}
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Van Dulst, D. Barreledness of subspaces of countable codimension and the closed graph theorem. Compositio Mathematica, Tome 24 (1972) no. 2, pp. 227-234. http://www.numdam.org/item/CM_1972__24_2_227_0/

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