@article{JRAM_1937__176_149977,
     author = {Ugo Broggi},
     title = {Su due sistemi associati di infinite equazioni lineari.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {25--30},
     publisher = {mathdoc},
     volume = {176},
     year = {1937},
     zbl = {0015.25801},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1937__176_149977/}
}