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
title: www-udk : a web-based environmental meta-information system. authors: r kramer , r nikolai , a koschel , c rolker , p. venue: sigmod record ,. year: 1997.0