@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/