@article{10_4064_ap_72_2_131_144,
     author = {Angel Mart{\'\i}nez Mel\'endez and Antoni Wawrzy\'nczyk},
     title = {An approach to joint spectra},
     journal = {Annales Polonici Mathematici},
     pages = {131--144},
     publisher = {mathdoc},
     volume = {72},
     number = {2},
     year = {1999},
     doi = {10.4064/ap-72-2-131-144},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-72-2-131-144/}
}