@unpublished{eprints2517,
            year = {2012},
       booktitle = {Workshop 2012 Turin - Virtual testing of materials and structures},
           title = {Second-gradient computational homogenization of periodic materials},
          author = {Andrea Bacigalupo and Luigi Gambarotta},
           month = {October},
             url = {http://eprints.imtlucca.it/2517/}
}