@unpublished{eprints2499,
          author = {Antonio Bucchiarone and Claudio Antares Mezzina and Heorhi Raik},
            year = {2014},
       booktitle = {2nd workshop of the fundamentals  of collective adaptive systems },
           title = {A goal model for collective adaptive systems},
           month = {September},
             url = {http://eprints.imtlucca.it/2499/}
}