@article{10_4064_sm_49_3_263_266,
     author = {B\'ela Bollob\'as},
     title = {Normally subregular systems in normed algebras},
     journal = {Studia Mathematica},
     pages = {263--266},
     publisher = {mathdoc},
     volume = {49},
     number = {3},
     year = {1973},
     doi = {10.4064/sm-49-3-263-266},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-49-3-263-266/}
}