@InProceedings{Amati&al:ComSen98,
      author =       " Amati,Gianni and Pirri,Fiora",
       title  =      " {Contexts as Relativized Definitions:  a Formalization via Fixed Points}",
      booktitle =   "Working Papers of Common Sense 98, Fourth Symposium on Logical Formalizations of Commonsense Reasoning",
        address =    "London",
         month =     jan,
       year=        "1998",
      publisher=   "Queen Mary University",
      pages = "114--125",
}