http://www.maths.qmul.ac.uk/~raw/talks_files/Leech.pdf
[1]http://www.math.lsa.umich.edu/~rlg/mathclubtalklattices21oct10d.pdf
http://en.wikipedia.org/wiki/Leech_lattice
http://en.wikipedia.org/wiki/II25,1
골레이 코드 (Golay code)