@article{JRAM_1974__267_151438,
     author = {Gerhard Grimeisen},
     title = {An exchange theorem for infinite sums and limits in {Banach} spaces.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {115--132},
     publisher = {mathdoc},
     volume = {267},
     year = {1974},
     zbl = {0287.40012},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1974__267_151438/}
}