Jost Enderle Nicole Schneider Thomas Seidl Efficiently Processing Queries on Interval-and-Value Tuples in Relational Databases. 385-396 2005 conf/vldb/2005 VLDB http://www.vldb2005.org/program/paper/wed/p385-enderle.pdf db/conf/vldb/vldb2005.html#EnderleSS05