Takeshi Horie Takuya Ukon Tatsuo Tsuji Ken Higuchi An Efficient Parallel Retrieval for Complex Object Index. 1266 2005 ICDE Workshops http://doi.ieeecomputersociety.org/10.1109/ICDE.2005.190 db/conf/icde/icdew2005.html#HorieUTH05