Marie-Noëlle Terrasse George Becker Marinette Savonnet Eric Leclercq Operations on Metamodels in the Context of a UML-Based Metamodeling Architecture. 391-397 2003 conf/ideas/2003 IDEAS http://csdl.computer.org/comp/proceedings/ideas/2003/1981/00/19810391abs.htm db/conf/ideas/ideas2003.html#TerrasseBSL03