@article{1077375369,
author = {Ruckle, William H.},
title = {The infinite sum of closed subspaces of an
$F$ -space},
journal = {Duke Math. J.},
volume = {31},
number = {1},
year = {1964},
pages = { 543-554},
language = {en},
url = {http://dml.mathdoc.fr/item/1077375369}
}
Ruckle, William H. The infinite sum of closed subspaces of an $F$ -space. Duke Math. J., Tome 31 (1964) no. 1, pp. 543-554. http://gdmltest.u-ga.fr/item/1077375369/