On the Optimal Ordering of Maps, Selections, and Joins Under Factorization.

Thomas Neumann Sven Helmer Guido Moerkotte On the Optimal Ordering of Maps, Selections, and Joins Under Factorization. 115-126 2006 BNCOD http://dx.doi.org/10.1007/11788911_10 db/conf/bncod/bncod2006.html#NeumannHM06