title: vxmlr : a visual xml-relational database system vldb. authors: a zhou , h lu , s zheng , y liang , l zhang , w ji , z tian. venue: nan. year: 2001.0
title: integration of time versions into a relational database system vldb , 1984.0. authors: p dadam , vy lum , hd werner. venue: nan. year: nan