Franky Lam William M. Shui Damien K. Fisher Raymond K. Wong Skipping Strategies for Efficient Structural Joins. 196-207 http://dx.doi.org/10.1007/978-3-540-24571-1_17 2004 conf/dasfaa/2004 DASFAA db/conf/dasfaa/dasfaa2004.html#LamSFW04