title: garbage collection in object oriented databases using transactional cyclic reference counting. authors: s. sudarshan , prasan roy , abraham silberschatz , s. seshadri , srinivas ashwin. venue: vldb. year: 1997
title: evaluating functional joins along nested reference sets in object-relational and object-oriented databases. authors: reinhard braumandl , jens clau &#223; en , alfons kemper. venue: very large data bases. year: 1998