Ana Paula Afonso Mário J. Silva João P. Campos Francisco S. Regateiro The Design and Implementation of the Ubidata Information Dissemination Framework. 371-373 http://dx.doi.org/10.1007/3-540-48157-5_50 1999 conf/huc/1999 HUC db/conf/huc/huc1999.html#AfonsoSCR99