http://www.cse.psu.edu/~summersc/cs201c/rec2.html

http://216.239.33.100/search?q=cache...hl=en&ie=UTF-8

http://www.colchsfc.ac.uk/computing/...y/binnotes.htm

http://www.rz.uni-hohenheim.de/rz/sy...sc102/ch3.html