@article{10_4064_sm_61_3_257_268,
     author = {Jaroslav Zem\'anek},
     title = {Spectral radius characterization of commutativity in {Banach} algebras},
     journal = {Studia Mathematica},
     pages = {257--268},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {1977},
     doi = {10.4064/sm-61-3-257-268},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-61-3-257-268/}
}