Elena Camossi Elisa Bertino Marco Mesiti Giovanna Guerrini Handling Expiration of Multigranular Temporal Objects. 23-50 2004 14 J. Log. Comput. 1 http://dx.doi.org/10.1093/logcom/14.1.23 db/journals/logcom/logcom14.html#CamossiBMG04