title: www-udk : a web-based environmental meta-information system. authors: r kramer , r nikolai , a koschel , c rolker , p lockemann , a keitel , r legat , k zirm. venue: sigmod record. year: 1997.0
title: ecobaseâ ?? database and web technologies for environmental information systems 1999.0. authors: ak tanaka , p valduriez. venue: nan. year: nan