title: www-udk : a web-based environmental meta-information system rudolf legat , arne koschel , andree keitel , ralf kramer , claudia rolker , ralf nikolai , peter c. lockemann , konrad zirm 1997. authors: nan. venue: sigmod record. year: nan
title: sit-in : a real-life spatio-temporal information system giuseppe sindoni , leonardo tininini , amedea ambrosetti , cristina bedeschi , stefano de francisci , orietta gargano , rossella molinaro , mario paolucci , paola patteri , pina ticca very large data bases. authors: nan. venue: nan. year: 2001.0