@inproceedings{DBLP:conf/dexa/CellaryJK91,
author = {Wojciech Cellary and
Genevi{\`e}ve Jomier and
Tomasz Koszlajda},
title = {Formal Model of an Object-Oriented Database with Versioned
Objects and Schema},
booktitle = {DEXA},
year = {1991},
pages = {239-244},
bibsource = {DBLP, http://dblp.uni-trier.de}
}