title: on the semantics of `` now '' in databases christian s. jensen , tomás isakowitz , richard t. snodgrass , curtis e. dyreson , james clifford 1997. authors: nan. venue: acm trans . database syst .. year: nan
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