@inproceedings{eprints1700,
          author = {Giorgio Gnecco and Marco Gori and Stefano Melacci and Marcello Sanguineti},
            year = {2013},
       booktitle = {23rd International Conference on Artificial Neural Networks},
           month = {September},
           title = {Learning with hard constraints},
             url = {http://eprints.imtlucca.it/1700/}
}