@article{BUMI_2006_8_9A_3-2_a1,
     author = {Bertsch, Michiel},
     title = {Prefazione},
     journal = {Bollettino della Unione matematica italiana},
     pages = {9--10},
     publisher = {mathdoc},
     volume = {Ser. 8, 9A},
     number = {3-2},
     year = {2006},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2006_8_9A_3-2_a1/}
}