@article{10_21136_MB_2018_0098_17,
     author = {Wawrzy\'nczyk, Antoni},
     title = {Subsets of nonempty joint spectrum in topological algebras},
     journal = {Mathematica Bohemica},
     pages = {441--448},
     publisher = {mathdoc},
     volume = {143},
     number = {4},
     year = {2018},
     doi = {10.21136/MB.2018.0098-17},
     mrnumber = {3895267},
     zbl = {06997377},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2018.0098-17/}
}