@article{10_4064_sm_121_2_185_192,
     author = {Graham R. Allan},
     title = {Sums of idempotents and a lemma of {N.} {J.} {Kalton}},
     journal = {Studia Mathematica},
     pages = {185--192},
     year = {1996},
     volume = {121},
     number = {2},
     doi = {10.4064/sm-121-2-185-192},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-121-2-185-192/}
}