Arthur, David, Vassilvitskii, Sergei:
k-means++: the advantages of careful seeding.
In: SODA '07: Proceedings of the eighteenth annual ACM-SIAM symposium on Discrete algorithms.
Philadelphia, PA, USA
: Society for Industrial and Applied Mathematics,
2007. - ISBN
978-0-898716-24-5,
S. 1027--1035