Sébastien Iksal Serge Garlatti Revisiting and Versioning in Virtual Special Reports. 264-279 2001 conf/ohs/2001 OHS-7/SC-3/AH-3 http://dx.doi.org/10.1007/3-540-45844-1_25 db/conf/ohs/ohs2001.html#IksalG01