@article{10_21136_CMJ_1978_101513,
     author = {Sawo\'n, Zbigniew},
     title = {Some remarks about the three spaces problem in {Banach} algebras},
     journal = {Czechoslovak Mathematical Journal},
     pages = {56--58},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1978},
     doi = {10.21136/CMJ.1978.101513},
     mrnumber = {0467315},
     zbl = {0418.46037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1978.101513/}
}