+ publisher = {Lulu},
+ year = {2004},
+ OPThowpublished = {http://labs.truelite.it/documenti/firewall.pdf},
+ OPTkey = {},
+ OPTaddress = {},
+ OPTmonth = {},
+ OPTyear = {},
+ OPTnote = {},
+ OPTannote = {}
+}
+@Book{SGL,
+ title = {La gestione della sicurezza con GNU/Linux},
+ author = {Simone Piccardi},
+ editor = {Truelite Srl},
+ publisher = {Lulu},