Hsiao-Mei Lu Sumeet Gupta Yang Dai Reducing large diagonals in kernel matrices through semidefinite programming. 57-62 2003 conf/kdd/2003bio BIOKDD http://www.cs.rpi.edu/~zaki/BIOKDD03/proceedings/10-lu.pdf db/conf/kdd/biokdd2003.html#LuGD03