@article{ARM_1966_2_4_a1,
     author = {Kluv\'anek, Igor},
     title = {Characterization of scalar-type spectral operators},
     journal = {Archivum mathematicum},
     pages = {153--156},
     year = {1966},
     volume = {2},
     number = {4},
     mrnumber = {0211281},
     zbl = {0206.13704},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1966_2_4_a1/}
}