W. Scheufele

On the complexity of generating optimal plans with cross products (extended abstract)

Guido Moerkotte, Wolfgang Scheufele, G. Moerkotte, 1997, PODS '97.

Optimal Ordering of Selections and Joins in Acyclic Queries with Expensive Predicates

Guido Moerkotte, Wolfgang Scheufele, G. Moerkotte, 1996 .

Efficient Dynamic Programming Algorithms for Ordering Expensive Joins and Selections

Guido Moerkotte, Wolfgang Scheufele, G. Moerkotte, 1998, EDBT.

Constructing Optimal Bushy Processing Trees for Join Queries is NP-hard

Guido Moerkotte, Wolfgang Scheufele, G. Moerkotte, 1996 .