A Pragmatic Method for the Integration of Higher-Order Entity-Relationship Schemata.

Thomas Lehmann Klaus-Dieter Schewe A Pragmatic Method for the Integration of Higher-Order Entity-Relationship Schemata. 37-51 http://link.springer.de/link/service/series/0558/bibs/1920/19200037.htm 2000 ER db/conf/er/er2000.html#LehmannS00