title: on-line reorganization in object databases. authors: s. sudarshan , rajeev rastogi , s. seshadri , mohana krishna lakhamraju. venue: sigmod conference. year: 2000
title: schema and database evolution in the o2 object database system. authors: fabrizio ferrandina , thorsten meyer , roberto zicari , guy ferran , jo &#235; lle madec. venue: very large data bases. year: 1995