Efficient algorithms for exact ranked twig-pattern matching over graphs.

Gang Gou Rada Chirkova Efficient algorithms for exact ranked twig-pattern matching over graphs. 581-594 2008 SIGMOD Conference http://doi.acm.org/10.1145/1376616.1376676 conf/sigmod/2008 db/conf/sigmod/sigmod2008.html#GouC08