Microsoft, "Answering Top-k Queries in Arbitrary Subspaces by Combining the Layer-Based Approach and the List-Based Approach," 2009.2 - 2010.2 (¿¬±¸Ã¥ÀÓÀÚ)
Microsoft, "Answering Top-k Queries Using a Partitioned Layer Index,"
2008.2 - 2009.2 (¿¬±¸Ã¥ÀÓÀÚ).
Çѱ¹°úÇÐÀç´Ü, "À¯ºñÄõÅͽº µ¥ÀÌÅͺ£À̽º ¿£Áø," National Research Laboratory (NRL), 2007.7 - 2015.6 (¿¬±¸Ã¥ÀÓÀÚ)