@article{STUMA_1996__119_2_216289,
     author = {V. Kordula and V. M\"uller},
     title = {On the axiomatic theory of spectrum},
     journal = {Studia Mathematica},
     pages = {109},
     publisher = {mathdoc},
     volume = {119},
     number = {2},
     year = {1996},
     zbl = {0857.47001},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/STUMA_1996__119_2_216289/}
}