title: on the issue of valid time ( s ) in temporal databases s kokkotos , e ioannidis , t panayiotopoulos , c spyropoulos 1995. authors: nan. venue: sigmod record. year: nan
title: on the issue of valid time ( s ) in temporal databases s kokkotos , ev ioannidis , t panayiotopoulos , cd. authors: nan. venue: sigmod record ,. year: 1995.0