Neumann, Thomas Databases and Information Systems, MPI for Informatics, Max Planck Society;
Neumann, T., Helmer, S., & Moerkotte, G. (2006). On the Optimal Ordering of Maps, Selections, and Joins Under Factorization. In Flexible and efficient information handling : 23rd British National Conference on Databases, BNCOD 23 (pp. 115-126). Berlin, Germany: Springer.