@article{10_4064_sm_50_2_127_148,
     author = {W. \.Zelazko and Z. S{\l}odkowski},
     title = {On joint spectra of commuting families of operators},
     journal = {Studia Mathematica},
     pages = {127--148},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {1974},
     doi = {10.4064/sm-50-2-127-148},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-50-2-127-148/}
}