Optimierung objektorientierter Anfragen mittels einer Blackboard-Architektur. - Alfons Kemper; Guido Moerkotte; Klaus Peithner (Datenbank Rundbr., 1992)

A Blackboard Architecture for Query Optimization in Object Bases. - Alfons Kemper; Guido Moerkotte; Klaus Peithner (VLDB, 1993)

Optimizing Disjunctive Queries with Expensive Predicates. - Alfons Kemper; Guido Moerkotte; Klaus Peithner; Michael Steinbrunn (SIGMOD Conference, 1994)

Bypassing Joins in Disjunctive Queries. - Michael Steinbrunn; Klaus Peithner; Guido Moerkotte; Alfons Kemper (VLDB, 1995)

Optimierung deklarativer Anfragen in Objektbanken. - Klaus Peithner (Infix Verlag, St. Augustin, Germany, 1996)

Optimizing Queries with Universal Quantification in Object-Oriented and Object-Relational Databases. - Jens Claußen; Alfons Kemper; Guido Moerkotte; Klaus Peithner (VLDB, 1997)

Optimization and Evaluation of Disjunctive Queries. - Jens Claußen; Alfons Kemper; Guido Moerkotte; Klaus Peithner; Michael Steinbrunn (IEEE Trans. Knowl. Data Eng., 2000)