title: sit-in : a real-life spatio-temporal information system stefano de francisci , rossella molinaro , orietta gargano , mario paolucci , leonardo tininini , giuseppe sindoni , paola patteri , amedea ambrosetti , pina ticca , cristina bedeschi 2001. authors: nan. venue: vldb. year: nan
title: www-udk : a web-based environmental meta-information system ralf kramer , ralf nicholai , arne koschel , claudia rolker , peter lockemann , andree keitel , rudolf legat , konrad tirm 1997. authors: nan. venue: acm sigmod record. year: nan