"Space-Partitioning-Based Bulk-Loading for the NSP-Tree in Non-ordered Discrete Data Spaces," DEXA 2008, September 1-5, Turin, Italy, Gang Quian, Hyun-Jeon Seik,Qiang Zhu,Sakti Pramanik.
"The C-ND Tree: A Multidimensional Index for Hybrid Continuous and Non-ordered Discrete Data Spaces NSP-Tree in Non-ordered Discrete Data Spaces," EDBT-2009, Saint-Petersburg, Russia, March 23-26, Changqing Chen, Sakti Pramanik, Qiang Zhu, Alok Watve, Gang Qian.
"Bulk-Loading the ND-Tree in Non-ordered Discrete Data Spaces," Best Paper Award, 13th International Conference, DASFAA 2008 (pp. 156-172), New Delhi, India, Hyun-Jeon Seik, Gang Qian, Qiang Zhu, Alexander R. Oswald and Sakti Pramanik.
"On k-Nearest Neighbor Searching in Non-Ordered Discrete Data Spaces," IEEE International Conference on Data Engineering (ICDE-07), April 16-20, 2007, Istanbul, Turkey, Dashiell Kolbe, Qiang Zhu and Sakti Pramanik.