@article{RSMUP_1976__56__79_0,
     author = {Artico, Giuliano and Marconi, Umberto},
     title = {On the compactness of minimal spectrum},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {79--84},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {56},
     year = {1976},
     mrnumber = {480463},
     zbl = {0381.13003},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1976__56__79_0/}
}