title: the semantic web : semantics for data on the web. authors: vipul kashyap , stefan decker. venue: vldb. year: 2003.0
title: on the semantics of now in databases acm transactions on database systems ( tods ). authors: james clifford , curtis dyreson , tom &#225; s isakowitz , christian s. jensen , richard thomas snodgrass. venue: nan. year: 1997.0