@article{BUMI_1963_3_18_3_a12,
     author = {Gallarati, Dionisio},
     title = {Un'osservazione sopra i semigruppi.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {279--280},
     publisher = {mathdoc},
     volume = {Ser. 3, 18},
     number = {3},
     year = {1963},
     zbl = {0117.26505},
     mrnumber = {154936},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1963_3_18_3_a12/}
}