title: mining multi-dimensional constrained gradients in data cubes jiawei han , ke wang , joyce m. w. lam , guozhu dong , jian pei 2001. authors: nan. venue: vldb. year: nan
title: quasi-cubes : exploiting approximations in multidimensional databases 1997. authors: daniel barbar &#225; , mark sullivan. venue: acm sigmod record. year: nan