Dan Olteanu Jiewen Huang Christoph Koch SPROUT: Lazy vs. Eager Query Plans for Tuple-Independent Probabilistic Databases. 640-651 2009 ICDE http://doi.ieeecomputersociety.org/10.1109/ICDE.2009.123 conf/icde/2009 db/conf/icde/icde2009.html#OlteanuHK09