REPEC: http://ideas.repec.org/e/pfl10.html
CIRIEC: http://www.ciriec.ulg.ac.be/en/pages/6_2working_papers.htm
D’AGLIANO: http://www.dagliano.unimi.it/publications/working-papers/
SSRN: http://www.ssrn.com/
Bepress: http://services.bepress.com/unimi/
CSIL: http://www.csilmilano.com/
FEEM: http://www.feem.it/