@article{10_4064_sm_51_2_87_96,
     author = {B\'ela Bollob\'as},
     title = {Best possible bounds of the norms of inverses adjoined to normed algebras},
     journal = {Studia Mathematica},
     pages = {87--96},
     publisher = {mathdoc},
     volume = {51},
     number = {2},
     year = {1974},
     doi = {10.4064/sm-51-2-87-96},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-51-2-87-96/}
}