@article{AUPO_1978__17_1_a10,
     author = {\v{S}t\v{e}rbov\'a, Dina},
     title = {On the spectral properties of elements of the type exp(ih) in {Hermitian} {Banach} algebras},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {109--114},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {1978},
     mrnumber = {0554041},
     zbl = {0433.46041},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1978__17_1_a10/}
}