Roberto Alfieri Roberto Cecchini Vincenzo Ciaschini Luca dell'Agnello Ákos Frohner Alberto Gianoli Károly Lörentey Fabio Spataro VOMS, an Authorization System for Virtual Organizations. 33-40 http://dx.doi.org/10.1007/978-3-540-24689-3_5 2003 conf/eagc/2003 European Across Grids Conference db/conf/eagc/eagc2003.html#AlfieriCCdFGLS03