Ralf Hartmut Güting Stefan Dieker Claudia Freundorfer Ludger Becker Holger Schenk SECONDO/QP: Implementation of a Generic Query Processor. 66-87 http://link.springer.de/link/service/series/0558/bibs/1677/16770066.htm 1999 conf/dexa/1999 DEXA db/conf/dexa/dexa99.html#GutingDFBS99