XISS/R: XML Indexing and Storage System Using RDBMS, Philip J. Harding, Quanzhong Li and Bongki Moon, Proceedings of the 29th International Conference on Very Large Databases (VLDB'2003), Berlin, Germany, September 2003. (demo paper) 

Partition Based Path Join Algorithms for XML Data, Quanzhong Li and Bongki Moon, Proceedings of the 14th International Conference on Database and Expert Systems Applications (DEXA'2003), pages 160-170, Prague, Czech Republic, September 2003.

Indexing and Querying XML Data for Regular Path Expressions, Quanzhong Li and Bongki Moon, Proceedings of the 27th International Conference on Very Large Databases (VLDB'2001), pages 361-370, Rome, Italy, September 2001.