@article{10_4064_sm_61_3_239_255,
     author = {Zbigniew S{\l}odkowski},
     title = {An infinite family of joint spectra},
     journal = {Studia Mathematica},
     pages = {239--255},
     publisher = {mathdoc},
     volume = {61},
     number = {3},
     year = {1977},
     doi = {10.4064/sm-61-3-239-255},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-61-3-239-255/}
}